Run clang-format over ConstantFolding.h, fixing inconsistent indentation.  NFC.
Run clang-format over ConstantFolding.h, fixing inconsistent indentation.  NFC.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@258361 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 397090c163992702272b4e8755eab3479d45aee2)

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