[llvm-bugs] [Bug 31881] New: Cherry pick r294088 to 4.0 branch (MachineCopyPropagation fix)

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https://llvm.org/bugs/show_bug.cgi?id=31881

            Bug ID: 31881
           Summary: Cherry pick r294088 to 4.0 branch
                    (MachineCopyPropagation fix)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: matze at braunis.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17940
  --> https://llvm.org/bugs/attachment.cgi?id=17940&action=edit
Patch adapted to 4.0 branch

r294088 addresses a miscompile in situations with non-coalesced COPY
instructions in combination with deeper register hierarchies (ARMv7 neon in
this case). The problem was found in swift code but the issue is general.

The patch needs to be slightly adapted for the 4.0 branch, I attached a patch.

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