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[LLVMABI] Align RecordType::isEmpty() with Clang's isEmptyRecord() (#218546)

[LLVMABI] Align RecordType::isEmpty() with Clang's isEmptyRecord()

While working on empty record handling for AArch64, I stumbled across a
couple of differences between the LLVM ABI library's
`RecordType::isEmpty()` and Clang's `CodeGen::isEmptyRecord()`. Testing
verified this led to observable differences in classification when using
the ABI library.

This change updates the ABI library's empty record handling to match
Clang.

Assisted-by: Cursor / various models

Reapply "[SandboxIR] Callback registration now allows specifying order (#221008) (#221017)

This reverts commit 89082772bed1ed16c0311b12147a96c35bb063d8.
And includes the fix.

[𝘀𝗽𝗿] initial version

Created using spr 1.3.7

[orc-rt] Make ExecutorProcessInfo platform-generic (#220938)

ExecutorProcessInfo was part generic, part system-specific: some of its
methods were implemented directly in its own .cpp, others only existed
as out-of-line definitions in per-OS files under lib/bedrock/sys/.

Move the system-specific pieces into free functions under orc_rt::sys
(mirroring the existing support/sys/ convention), and have
ExecutorProcessInfo consume them like any other client. The class itself
is now fully generic, with no system-specific code of its own.

No functional change, except that page-size detection (previously
hardcoded to POSIX sysconf) now goes through the same per-OS split as
the rest of ExecutorProcessInfo; a Windows implementation is left for a
follow-up.

[lldb][test] Rerun tests that hit a known flaky failure (#221006)

macOS 26.3 denies debugserver permission to attach when too many debug
sessions start at once, which surfaces as a test failing with "process
exited with status -1". The denial is intermittent and a rerun normally
gets through.

Gate the rerun on a list of known flake signatures rather than retrying
every failure, because a blanket retry masks real bugs. Adding to that
list is a last resort for defects outside LLDB's control.

[MLIR] Move inferred remainder bounds into results (NFC) (#221081)

Move locally computed signed and unsigned remainder bounds into their
final range accumulators when the special-case bounds are selected.

Found by Coverity.

Assisted-by: Codex

Carry null operands and intrinsic names across when promoting to VGPRs

Count the intrinsics that really become calls when refusing promotion

Propagate object liveness to every changed successor, not only back edges

Promote private objects into the VGPR address space via flag

Refuse promotion only when the object is live across a call

Treat a sub-dword VGPR-memory load as divergent too

Diagnose an object that does not fit the function's register budget

Do not add a second lifetime start when allocating VGPRs again

Pin the width guard that keeps sub-dword accesses out of aliasing decisions

Allocate and reserve registers for address space 13 objects

Diagnose inline asm that clobbers a VGPR-memory object's registers

Regenerate the sub-dword expectations for the M0 setup change

Regenerate the demanded-bits expectations for the gfx1250 entry sequence

Document the sub-dword access rules for the VGPR address space

Check the encodings of the sub-dword VGPR-memory accesses

Inherit the M0 operand when expanding the sub-dword VGPR-memory pseudos

Adopt subarch triples in the sub-dword tests and drop the redundant VALU

Simplify the sub-dword VGPR-memory pseudo definitions

Also build the sub-dword VGPR-memory tests for wave64

Fix tests

Do not describe sub-dword VGPR-memory accesses by index and width

Test sub-dword VGPR-memory accesses across control flow

Cover the remaining VGPR-memory operand invariants

NFC: track the downstream implementation more closely