[PATCH] D88659: [FE]Split SuitableAlign into two parts

[Xiangling Liao via Phabricator via cfe-commits]

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There are only two places where "SuitableAlign" is used:

- calculate 'BIGGEST_ALIGNMENT' macro
- alignment for 'Alloca' Inst

On some targets, like AIX, the two value are not equal. So we split `SuitableAlign` into two parts to meet the needs.

One is 'GuanranteedAlign'[?any better name] which is used to calculate 'BIGGEST_ALIGNMENT' and represent fundamental alignment requirement; the other one is still 'SuitableAlign' used to calculate alignment for 'Alloca' Inst.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88659

Files:
  clang/include/clang/Basic/TargetInfo.h
  clang/lib/Basic/TargetInfo.cpp
  clang/lib/Basic/Targets/AArch64.cpp
  clang/lib/Basic/Targets/ARC.h
  clang/lib/Basic/Targets/ARM.cpp
  clang/lib/Basic/Targets/AVR.h
  clang/lib/Basic/Targets/MSP430.h
  clang/lib/Basic/Targets/Mips.h
  clang/lib/Basic/Targets/PPC.h
  clang/lib/Basic/Targets/RISCV.h
  clang/lib/Basic/Targets/Sparc.h
  clang/lib/Basic/Targets/TCE.h
  clang/lib/Basic/Targets/WebAssembly.h
  clang/lib/Basic/Targets/X86.h
  clang/lib/Basic/Targets/XCore.h
  clang/lib/Frontend/InitPreprocessor.cpp
  clang/test/CodeGen/aix_alloca_align.c

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