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/Language/ObjC/NSArray.cpp b/lldb/source/Plugins/Language/ObjC/NSArray.cpp
index 9eec28b..ab1da08 100644
--- a/lldb/source/Plugins/Language/ObjC/NSArray.cpp
+++ b/lldb/source/Plugins/Language/ObjC/NSArray.cpp
@@ -57,7 +57,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 protected:
   virtual lldb::addr_t GetDataAddress() = 0;
@@ -242,7 +242,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   ExecutionContextRef m_exe_ctx_ref;
@@ -314,7 +314,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 };
 
 class NSArray1SyntheticFrontEnd : public SyntheticChildrenFrontEnd {
@@ -331,7 +331,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 };
 } // namespace formatters
 } // namespace lldb_private
@@ -544,7 +544,7 @@
 
 size_t
 lldb_private::formatters::NSArrayMSyntheticFrontEndBase::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   const char *item_name = name.GetCString();
   uint32_t idx = ExtractIndexFromString(item_name);
   if (idx < UINT32_MAX && idx >= CalculateNumChildren())
@@ -633,7 +633,7 @@
 template <typename D32, typename D64, bool Inline>
 size_t
 lldb_private::formatters::GenericNSArrayISyntheticFrontEnd<D32, D64, Inline>::
-  GetIndexOfChildWithName(const ConstString &name) {
+  GetIndexOfChildWithName(ConstString name) {
   const char *item_name = name.GetCString();
   uint32_t idx = ExtractIndexFromString(item_name);
   if (idx < UINT32_MAX && idx >= CalculateNumChildren())
@@ -723,7 +723,7 @@
 
 size_t
 lldb_private::formatters::NSArray0SyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   return UINT32_MAX;
 }
 
@@ -752,7 +752,7 @@
 
 size_t
 lldb_private::formatters::NSArray1SyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   static const ConstString g_zero("[0]");
 
   if (name == g_zero)