[NFC] Reformat all the LLVMs

Reformatting everything now that we have `llvm` namespaces. I've
separated this from the main commit to help manage merge-conflicts and
for making it a bit easier to read the mega-patch.

lib/DriverTool/swift_llvm_opt_main.cpp

@@ -143,7 +143,8 @@ getTargetMachine(llvm::Triple TheTriple, StringRef CPUStr,
 
   return TheTarget->createTargetMachine(
       TheTriple.getTriple(), CPUStr, FeaturesStr, targetOptions,
-      llvm::Optional<llvm::Reloc::Model>(llvm::codegen::getExplicitRelocModel()),
+      llvm::Optional<llvm::Reloc::Model>(
+          llvm::codegen::getExplicitRelocModel()),
       llvm::codegen::getExplicitCodeModel(), GetCodeGenOptLevel(options));
 }