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[clang][bytecode] Make more reinterpret_casts non-fatal (#206056)

Looks like we can handle more of them these days.

[mlir][linalg] Restrict linalg.contract results (#205988)

I tightened linalg.contract so buffer-style uses cannot produce memref
results. This keeps the op consistent with destination-style semantics
and turns the bad input into a verifier error instead of letting later
rewrites crash.
Fixes #205708

[lldb][driver] Fix ELF interposition of HostInfoBase symbols causing segfault (#204710)

Commit 67e571d (#179306) added lldbHost and lldbUtility to
`LLDB_DRIVER_LINK_LIBS` A side-effect is that HostInfoBase.cpp, which
contains the file-static `g_fields` pointer, is now compiled into both
the lldb binary and liblldb.so, giving each its own independent
`g_fields`.

On ELF platforms this creates an interposition hazard. When
`LLDB_ENABLE_DYNAMIC_SCRIPTINTERPRETERS` is set, AddLLDB.cmake switches
all LLDB libraries to `CXX_VISIBILITY_PRESET=default` so that the
version script can re-export private symbols needed by dynamically
loaded plugins. The Python plugin calls `HostInfo::GetShlibDir()`
directly, so extract-dynamic-script-interpreter-exports.py adds
`HostInfoBase::GetShlibDir` to liblldb.so's exports (global: in the
version script). `HostInfoBase::Initialize()` is not called by the
plugin and stays local:.

At runtime the dynamic linker resolves liblldb.so's PLT entry for

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[Transforms] Remove redundant --check-prefix flags (#206211)

--check-prefix=CHECK is completely redundant, so remove it.

Change was generated by Gemini, I manually reviewed the entire diff.

Use LiveStacks instead of instruction scan within the reload block.

Revert "[lit] Migrate lit to ProcessPoolExecutor (#202681)" (#206138)

This reverts the commit 1e2d1bbc12f6.

ProcessPoolExecutor.shutdown(wait=True) hangs on macOS 14 with Python 3.9:  join_executor_internals() calls call_queue.join_thread() before p.join(), but macOS requires the inverse order. The feeder thread cannot drain until worker processes are joined, so join_thread() blocks forever. This is fixed upstream in CPython >= 3.12 but affects all earlier versions on macOS. Reverting to unblock the aarch64-darwin buildbot while a proper fix is worked out.

The original changes and context can be found in https://github.com/llvm/llvm-project/pull/202681

[llubi] Poison object contents in `llvm.lifetime.end` (#206036)

Make `@llvm.lifetime.end` poison the object content. This removes the
need of special-casing for dead objects in `ExecutorBase::load()`, etc.

See also [#204932
(comment)](https://github.com/llvm/llvm-project/pull/204932#discussion_r3465364425).

Merge users/rnk/clang-md-1b into markdown-docs

[WebAssembly] Fix nondeterminism by using MapVector for pointer-keyed maps [NFC] (#205184)

Several DenseMaps in the WebAssembly backend keyed by pointers were
being
iterated over, potentially leading to nondeterministic codegen
(differing
try/delegate nesting, virtual register allocation, or PHI node
insertion)
due to nondeterministsic pointer values.

This patch replaces these DenseMaps with MapVectors to guarantee
deterministic iteration order:
  - UnwindDestToTryRanges in WebAssemblyCFGStackify.cpp
  - EHPadToUnwindDest in WebAssemblyCFGStackify.cpp
  - EHPadToRethrows in WebAssemblyLateEHPrepare.cpp
  - UnwindDestToNewPreds in WebAssemblyLowerEmscriptenEHSjLj.cpp

Fixes: #204883

Co-authored-by: Ammar Askar <aaskar at google.com>
Assisted-by: Antigravity

[docs] Fix follow-up MyST rendering issues

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