Get a little bit smarter about killing off the ReturnValue alloca
in the presence of straight-line cleanups.  This is a simple but
important case, particularly for ARC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149190 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed