clang-format llvm-as.cpp (NFC)

This reduces unrelated changes in other patches (such as D18763) when
changes to this file are clang formatted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265346 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed