Refactor: Simplify boolean conditional return statements in lib/Frontend

[LegalizeAdulthood]

Summary

Use clang-tidy to simplify boolean conditional return statements

[LegalizeAdulthood]

Update to latest

[LegalizeAdulthood]

This changeset needs review; I'm unsure of who to add as explicit reviewers.

[alexfh]

LG

cfe/trunk/lib/Frontend/VerifyDiagnosticConsumer.cpp

 public:
   RegexDirective(SourceLocation DirectiveLoc, SourceLocation DiagnosticLoc,
                  bool MatchAnyLine, StringRef Text, unsigned Min, unsigned Max,
                  StringRef RegexStr)
     : Directive(DirectiveLoc, DiagnosticLoc, MatchAnyLine, Text, Min, Max),
       Regex(RegexStr) { }
 
   bool isValid(std::string &Error) override {
-    if (Regex.isValid(Error))
-      return true;
-    return false;
+    return Regex.isValid(Error);
   }
 
   bool match(StringRef S) override {
     return Regex.match(S);
   }
 
 private:
   llvm::Regex Regex;