[clang] Fix -Wsign-compare in 32-bit builds

Author: MaskRay

clang/lib/Frontend/TextDiagnostic.cpp

@@ -145,7 +145,7 @@ printableTextForNextCharacter(StringRef SourceLine, size_t *I,
     (void)Res;
     assert(Res == llvm::conversionOK);
     assert(OriginalBegin < Begin);
-    assert((Begin - OriginalBegin) == CharSize);
+    assert(unsigned(Begin - OriginalBegin) == CharSize);
 
     (*I) += (Begin - OriginalBegin);
 

clang/lib/Lex/PPDirectives.cpp

@@ -546,7 +546,7 @@ void Preprocessor::SkipExcludedConditionalBlock(SourceLocation HashTokenLoc,
       if (!*SkipRangePtr) {
         *SkipRangePtr = Hashptr - BeginPtr;
       }
-      assert(*SkipRangePtr == Hashptr - BeginPtr);
+      assert(*SkipRangePtr == unsigned(Hashptr - BeginPtr));
       BeginPtr = nullptr;
       SkipRangePtr = nullptr;
     }