Pass ConstString by value (NFC)

My apologies for the large patch. With the exception of ConstString.h
itself it was entirely produced by sed.

ConstString has exactly one const char * data member, so passing a
ConstString by reference is not any more efficient than copying it by
value. In both cases a single pointer is passed. But passing it by
value makes it harder to accidentally return the address of a local
object.

(This fixes rdar://problem/48640859 for the Apple folks)

Differential Revision: https://reviews.llvm.org/D59030

llvm-svn: 355553
diff --git a/lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp b/lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp
index 6939f34..ff6fffb 100644
--- a/lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp
+++ b/lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp
@@ -1150,7 +1150,7 @@
 void SymbolFileNativePDB::DumpClangAST(Stream &s) { m_ast->Dump(s); }
 
 uint32_t SymbolFileNativePDB::FindGlobalVariables(
-    const ConstString &name, const CompilerDeclContext *parent_decl_ctx,
+    ConstString name, const CompilerDeclContext *parent_decl_ctx,
     uint32_t max_matches, VariableList &variables) {
   using SymbolAndOffset = std::pair<uint32_t, llvm::codeview::CVSymbol>;
 
@@ -1177,7 +1177,7 @@
 }
 
 uint32_t SymbolFileNativePDB::FindFunctions(
-    const ConstString &name, const CompilerDeclContext *parent_decl_ctx,
+    ConstString name, const CompilerDeclContext *parent_decl_ctx,
     FunctionNameType name_type_mask, bool include_inlines, bool append,
     SymbolContextList &sc_list) {
   // For now we only support lookup by method name.
@@ -1218,7 +1218,7 @@
 }
 
 uint32_t SymbolFileNativePDB::FindTypes(
-    const ConstString &name, const CompilerDeclContext *parent_decl_ctx,
+    ConstString name, const CompilerDeclContext *parent_decl_ctx,
     bool append, uint32_t max_matches,
     llvm::DenseSet<SymbolFile *> &searched_symbol_files, TypeMap &types) {
   if (!append)
@@ -1550,7 +1550,7 @@
 }
 
 CompilerDeclContext
-SymbolFileNativePDB::FindNamespace(const ConstString &name,
+SymbolFileNativePDB::FindNamespace(ConstString name,
                                    const CompilerDeclContext *parent_decl_ctx) {
   return {};
 }