[PATCH] D157565: [CodeGen] Add AArch64 behavior to existing MFS tests

[Daniel Hoekwater via Phabricator via llvm-commits]

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Rebase onto other MFS tests and fix the BBsections code that makes the test crash


X86 and AArch64 have some small differences in output because of non-MFS
factors (such as encoding function calls as `callq` vs `bl`). Add
AArch64 checks for tests where output varies between platforms even
if MFS logic doesn't. Add a debug flag to run MFS on any target.
Fix the encoding of nops in bbsections.

Without this change, there is no way to test that MFS functions correctly on AArch64.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157565

Files:
  llvm/lib/CodeGen/BasicBlockSections.cpp
  llvm/lib/CodeGen/MachineFunctionSplitter.cpp
  llvm/test/CodeGen/Generic/machine-function-splitter.ll

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