MIPS: Renamed "symbols" to "internalized strings" throughout the code base, in preparation of the i…

src/mips/builtins-mips.cc

Index: src/mips/builtins-mips.cc
diff --git a/src/mips/builtins-mips.cc b/src/mips/builtins-mips.cc
index 65081b982e2b1588db0343dfede65147c5eec3dd..f32b779578fa906d105b9f56259e82c17db9c0e9 100644
--- a/src/mips/builtins-mips.cc
+++ b/src/mips/builtins-mips.cc
@@ -698,7 +698,7 @@ void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
   // Load the empty string into a2, remove the receiver from the
   // stack, and jump back to the case where the argument is a string.
   __ bind(&no_arguments);
-  __ LoadRoot(argument, Heap::kEmptyStringRootIndex);
+  __ LoadRoot(argument, Heap::kempty_stringRootIndex);
   __ Drop(1);
   __ Branch(&argument_is_string);