test-release.sh: Run both .o files through sed before comparing them

test-release.sh: Run both .o files through sed before comparing them

On some systems (e.g. Mac OS X), sed will add a newline to the end of
the output if there wasn't one already. This would cause false
cmp errors since the .o file from Phase 2 was passed through sed and
the one from Phase 3 wasn't. Work around this by passing both through
sed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242341 91177308-0d34-0410-b5e6-96231b3b80d8