clang-format llvm-as.cpp (NFC)
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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@265346 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm