[llvm-bugs] [Bug 31889] New: Cherry pick r294268 to 4.0 branch (RegisterCoalescer: Fix joinReservedPhysReg())

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31889

            Bug ID: 31889
           Summary: Cherry pick r294268 to 4.0 branch (RegisterCoalescer:
                    Fix joinReservedPhysReg())
           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

This fixes a miscompile in the presence of reserved registers. This is not a
regression though (the bug was already present in 3.9) however the fix is
simple and low risk.

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