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[VPlan][NFC] Number blocks (#212023)

Assign numbers to blocks for more efficient dominator tree construction.
The number is identical to the index in CreatedBlocks of the VPlan.

This removes the last user of unnumbered graphs for dominator trees.

Note that the compile-time change here is practically unmeasurable. The
motivation really is to remove the non-number code path from the
dominator tree.

[MC][NFC] Use EnumStrings for AtSpecifiers (#211827)

Store at specifiers without relocations using EnumStrings, reducing
.data.rel.ro by 4-5kiB. This also saves the more compactly at now 6B per
entry instead of 24B.

[SimplfiyCFG] Deduplicate edges in `hoistSuccIdenticalTerminatorToSwitchOrIf` (#212017)

Fix domtree update by deduplicating edges to be inserted. Tested by the
function `@dedup`.

[spr] initial version

Created using spr 1.3.8-wip

[spr] initial version

Created using spr 1.3.8-wip

[PGO][HIP] Support hipModuleLoad in offload PGO (#211875)

Offload PGO finds profile sections by inspecting the image passed to
hipModuleLoadData. hipModuleLoad only provides a file name, so its
device
profile counters were not collected.

After a successful hipModuleLoad, read the code object with the existing
profile file-buffer helper and register it through the same path used by
in-memory module loads.

[DomTreeConstr][NFC] Resize NodeInfos once on construction (#211998)

This avoids frequent size checks when accessing node infos. All numbered
graphs support getMaxNumber().

Also move away from BB->getParent() as preliminary work for numbering
VPlan blocks -- there, getParent() has a different meaning.

[clang-tidy][docs] Rewrite remaining abseil check docs to Markdown (#212004)

This commit rewrites the reST documentation to Markdown.

Tracking issue: #201242
See the [migration guide] for more information. 

[migration guide]:
https://llvm.org/docs/SphinxQuickstartTemplate.html#markdown-migration-guidelines

AI Usage: This was prepared with rst2myst and GPT5.6-assisted cleanup, I
manually verified that all the documentations render as expected.

Preview site for reviewing:
https://broken.life/llvm-staging/abseil-markdown-port/

[clang-tidy][docs] Rename remaining abseil check docs to Markdown (#212003)

Tracking issue: https://github.com/llvm/llvm-project/issues/201242
See the [migration guide] for more information.

[migration guide]:

https://llvm.org/docs/SphinxQuickstartTemplate.html#markdown-migration-guidelines

This is the initial straight rename commit. It will probably break the
docs build, but it has to be a separate PR for blame preservation
purposes.

[AArch64] Add FMIN/FMAX clustering (#210906)

This patch adds a subtarget feature that controls scheduling FMIN/FMAX
instructions back to back. Enabled on Apple CPU.

[clang-tidy][docs] Rewrite remaining abseil check docs to Markdown

[clang-tidy][docs] Rename remaining abseil check docs to Markdown

[𝘀𝗽𝗿] changes to main this commit is based on

Created using spr 1.3.7

[skip ci]

[𝘀𝗽𝗿] initial version

Created using spr 1.3.7

[lldb] Allow multiple ABI runtimes for C++

[lldb] Move dynamic type cache to common ABI runtime

[lldb] Extract type lookup by name from Itanium ABI

Revert "[MachO] Preserve weak linkage for aliases" (#212009)

[SimplifyCFG] Fix DomTree update in `turnSwitchRangeIntoICmp` (#212006)

The original removal of `BB->Default` has been handled by
`createUnreachableSwitchDefault`.
When `OtherDest` is also unreachable, the edge should be removed.

This issue cannot be reproduced via
`-simplifycfg-require-and-preserve-domtree=1`. I just found it by
checking DT in `requestResimplify`.

[lldb] Allow multiple ABI runtimes for C++

[clang-tidy][docs] Rewrite remaining abseil check docs to Markdown

[libcxx] Speed up xsgetn for always_noconv

In the always_noconv path, optimize character reads in the same way as
xsgetn.

Unlike fread, getwc has different semantics, so the same optimization
cannot be applied to wide characters. Therefore, only optimize the char
path.

[lldb] Move dynamic type cache to common ABI runtime

[lldb] Extract type lookup by name from Itanium ABI

Revert "[MachO] Preserve weak linkage for aliases (#198148)"

This reverts commit 29575a3460b43132c7d973b502830897b02874a9.

[VPlan] Widen masked unit-stride consecutive accesses in VPlan. (#211315)

Extend the widenConsecutiveMemOps sub-pass to widen masked/predicated
unit-stride consecutive accesses VPlan-natively.

This requires exposing an instruction-independent
isLegalMaskedLoadOrStore in VPSelectionContext, as well as adding it to
VPCostContext. Some of the members will probably be useful for other
changes as well.

PR: https://github.com/llvm/llvm-project/pull/211315

[InstCombine] Fold icmp ptrtoaddr x, ptrtoaddr y -> icmp x, y (#211991)

Similar to the existing ptrtoint fold; this is valid, because icmp only
compares address bits. This addresses optimization regressions when
generating ptrtoaddr for pointer subtractions.

[clang-tidy][docs] Rewrite remaining abseil check docs to Markdown

[lldb] Move GetVTableInfo to C++ language runtime (#207010)

The original PR was reverted in
https://github.com/llvm/llvm-project/pull/206816 due to a test failure
on lldb-aarch64-ubuntu.
Since I couldn't reproduce the failure, I decided to split the PR into
smaller chunks.

This is part 1/4 (the final state is on
https://github.com/Nerixyz/llvm-project/tree/refactor/common-abi-runtime-take2-4-of-4).

It moves `GetVTableInfo` and `TypeHasVTable` from the Itanium ABI
runtime to the C++ language runtime. Eventually, this will be used to
select the ABI runtime that's able to handle a vtable. For now, we
always ask and use Itanium.

[clang-tidy][docs] Rename remaining abseil check docs to Markdown