MC: account for the return column in the CIE key

If the return column is different, we cannot coalesce the CIE across the
FDEs.  Add that to the key calculation.  This ensures that we emit a
separate CIE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309492 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed