https://bugs.llvm.org/show_bug.cgi?id=41523

            Bug ID: 41523
           Summary: [llvm-mca] Add support for nested and overlapping
                    region markers
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-mca
          Assignee: unassignedb...@nondot.org
          Reporter: llvm-...@redking.me.uk
                CC: andrea.dibia...@gmail.com, llvm-bugs@lists.llvm.org,
                    matthew.da...@sony.com

We sometimes want to analyze codegen in multiple regions, it'd be useful if we
could nest and overlap region markers to support this:


testloop:
# LLVM-MCA-BEGIN outer
  leal 42(%rdi), %eax
# LLVM-MCA-BEGIN inner
  imull %esi, %eax
# LLVM-MCA-END inner
  leal 42(%rdi), %eax
# LLVM-MCA-END outer
  imull %esi, %eax



testloop:
# LLVM-MCA-BEGIN upper
  leal 42(%rdi), %eax
# LLVM-MCA-BEGIN lower
  imull %esi, %eax
# LLVM-MCA-END upper
  leal 42(%rdi), %eax
# LLVM-MCA-END lower
  imull %esi, %eax

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