[AArch64] Fix some LLVM Coding Standards violations in the load/store optimizer.

Variable names should start with an upper case letter.

No change in functionality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210181 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed