Use // + #if 0/#endif to comment out a block of code.

Per the LLVM comment formatting guidelines.

Author: practicalswift

Diff for: lib/IRGen/TypeLayoutVerifier.cpp

@@ -149,8 +149,8 @@ irgen::emitTypeLayoutVerifier(IRGenFunction &IGF,
 
       // Verify that the extra inhabitant representations are consistent.
 
-      /* TODO: Update for EnumPayload implementation changes.
-      
+      // TODO: Update for EnumPayload implementation changes.
+#if 0
       auto xiBuf = IGF.createAlloca(fixedTI->getStorageType(),
                                     fixedTI->getFixedAlignment(),
                                     "extra-inhabitant");
@@ -212,7 +212,7 @@ irgen::emitTypeLayoutVerifier(IRGenFunction &IGF,
                llvm::Twine("extra inhabitant index calculation ")
                  + numberBuf.str());
       }
-       */
+#endif
     }
 
     // TODO: Verify interesting layout properties specific to the kind of type,

Diff for: lib/SIL/Verifier.cpp

@@ -1677,16 +1677,17 @@ class SILVerifier : public SILVerifierBase<SILVerifier> {
             || !isa<ExtensionDecl>(CMI->getMember().getDecl()->getDeclContext()),
             "extension method cannot be dispatched natively");
 
-    /* TODO: We should enforce that ObjC methods are dispatched on ObjC
-       metatypes, but IRGen appears not to care right now.
+    // TODO: We should enforce that ObjC methods are dispatched on ObjC
+    // metatypes, but IRGen appears not to care right now.
+#if 0
     if (auto metaTy = operandType.getAs<AnyMetatypeType>()) {
       bool objcMetatype
         = metaTy->getRepresentation() == MetatypeRepresentation::ObjC;
       bool objcMethod = CMI->getMember().isForeign;
       require(objcMetatype == objcMethod,
               "objc class methods must be invoked on objc metatypes");
     }
-     */
+#endif
   }
 
   void checkSuperMethodInst(SuperMethodInst *CMI) {