Remove redundant string initialization (NFC)

Identified by readability-redundant-string-init.

clang/include/clang/Basic/CodeGenOptions.h

@@ -307,7 +307,7 @@ public:
     std::shared_ptr<llvm::Regex> Regex;
 
     /// By default, optimization remark is missing.
-    OptRemark() : Kind(RK_Missing), Pattern(""), Regex(nullptr) {}
+    OptRemark() : Kind(RK_Missing), Regex(nullptr) {}
 
     /// Returns true iff the optimization remark holds a valid regular
     /// expression.

clang/include/clang/Tooling/ReplacementsYaml.h

@@ -30,8 +30,7 @@ template <> struct MappingTraits<clang::tooling::Replacement> {
   /// Helper to (de)serialize a Replacement since we don't have direct
   /// access to its data members.
   struct NormalizedReplacement {
-    NormalizedReplacement(const IO &)
-        : FilePath(""), Offset(0), Length(0), ReplacementText("") {}
+    NormalizedReplacement(const IO &) : Offset(0), Length(0) {}
 
     NormalizedReplacement(const IO &, const clang::tooling::Replacement &R)
         : FilePath(R.getFilePath()), Offset(R.getOffset()),

clang/lib/Driver/Driver.cpp

@@ -174,9 +174,9 @@ Driver::Driver(StringRef ClangExecutable, StringRef TargetTriple,
       CCPrintHeadersFilename(), CCLogDiagnosticsFilename(),
       CCCPrintBindings(false), CCPrintOptions(false), CCPrintHeaders(false),
       CCLogDiagnostics(false), CCGenDiagnostics(false),
-      CCPrintProcessStats(false), TargetTriple(TargetTriple),
-      CCCGenericGCCName(""), Saver(Alloc), CheckInputsExist(true),
-      GenReproducer(false), SuppressMissingInputWarning(false) {
+      CCPrintProcessStats(false), TargetTriple(TargetTriple), Saver(Alloc),
+      CheckInputsExist(true), GenReproducer(false),
+      SuppressMissingInputWarning(false) {
   // Provide a sane fallback if no VFS is specified.
   if (!this->VFS)
     this->VFS = llvm::vfs::getRealFileSystem();

clang/utils/TableGen/NeonEmitter.cpp

@@ -292,7 +292,7 @@ class Variable {
   std::string N;
 
 public:
-  Variable() : T(Type::getVoid()), N("") {}
+  Variable() : T(Type::getVoid()) {}
   Variable(Type T, std::string N) : T(std::move(T)), N(std::move(N)) {}
 
   Type getType() const { return T; }

lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp

@@ -59,7 +59,7 @@ uint32_t AppleObjCTypeEncodingParser::ReadNumber(StringLexer &type) {
 // "{CGRect=\"origin\"{CGPoint=\"x\"d\"y\"d}\"size\"{CGSize=\"width\"d\"height\"d}}"
 
 AppleObjCTypeEncodingParser::StructElement::StructElement()
-    : name(""), type(clang::QualType()) {}
+    : type(clang::QualType()) {}
 
 AppleObjCTypeEncodingParser::StructElement
 AppleObjCTypeEncodingParser::ReadStructElement(TypeSystemClang &ast_ctx,

llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp

@@ -97,8 +97,8 @@ private:
 
   class EvalResult {
   public:
-    EvalResult() : Value(0), ErrorMsg("") {}
-    EvalResult(uint64_t Value) : Value(Value), ErrorMsg("") {}
+    EvalResult() : Value(0) {}
+    EvalResult(uint64_t Value) : Value(Value) {}
     EvalResult(std::string ErrorMsg)
         : Value(0), ErrorMsg(std::move(ErrorMsg)) {}
     uint64_t getValue() const { return Value; }