ARM: use symbolic name for constant

This just changes the constant value to the symbolic name corresponding to it.
NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212011 91177308-0d34-0410-b5e6-96231b3b80d8
X86: fix comment

Fix a comment typo `DbgLocLImport` instead of `DLLImport`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212012 91177308-0d34-0410-b5e6-96231b3b80d8