[StatepointLowering] Minor NFC cleanups

 - Use auto
 - Name variables in LLVM style
 - Use llvm::find instead of std::find
 - Blank lines between declarations

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264129 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed