[all-commits] [llvm/llvm-project] 5932f7: [PatchableFunction] Use an empty DebugLoc

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 5932f7b8f2c9a5f3640cffa3e99a45923acb7201
      https://github.com/llvm/llvm-project/commit/5932f7b8f2c9a5f3640cffa3e99a45923acb7201
  Author: Fangrui Song <maskray at google.com>
  Date:   2020-02-01 (Sat, 01 Feb 2020)

  Changed paths:
    M llvm/lib/CodeGen/PatchableFunction.cpp
    M llvm/test/CodeGen/AArch64/patchable-function-entry-empty.mir

  Log Message:
  -----------
  [PatchableFunction] Use an empty DebugLoc

The current FirstMI.getDebugLoc() is actually null in almost all cases.
If it isn't, the generated .loc will be considered initial. The .loc
will have the prologue_end flag and terminate the prologue prematurely.

Also use an overload of BuildMI that will not prepend
PATCHABLE_FUNCTION_ENTRY to a MachineInstr bundle.