Silence a -Wsign-compare warning. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218868 91177308-0d34-0410-b5e6-96231b3b80d8
Support padding unaligned data in .text.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218870 91177308-0d34-0410-b5e6-96231b3b80d8