Fast string construct stub (ia32 only for now).

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index e5abfb468678d01e3bea35bfb401c35a3e34bc71..cd2f0f59fa038f1c5e4bbaefef8fa6c58790f2a4 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -140,6 +140,13 @@ class MacroAssembler: public Assembler {
   // Find the function context up the context chain.
   void LoadContext(Register dst, int context_chain_length);
 
+  // Load the global function with the given index.
+  void LoadGlobalFunction(int index, Register function);
+
+  // Load the initial map from the global function. The registers
+  // function and map can be the same.
+  void LoadGlobalFunctionInitialMap(Register function, Register map);
+
   // ---------------------------------------------------------------------------
   // JavaScript invokes