ia32: Fuse map and type checks in call ICs for API functions.

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 cc245602d84e6a491197f73933437ffa5841a388..a5da37aa56a7a1b046bd14ab197f818343d48f47 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -185,9 +185,14 @@ class MacroAssembler: public Assembler {
   // clobbered if it the same as the holder register. The function
   // returns a register containing the holder - either object_reg or
   // holder_reg.
+  // The function can optionally (when save_at_depth !=
+  // kInvalidProtoDepth) save the object at the given depth by moving
+  // it to [esp + kPointerSize].
   Register CheckMaps(JSObject* object, Register object_reg,
                      JSObject* holder, Register holder_reg,
-                     Register scratch, Label* miss);
+                     Register scratch,
+                     int save_at_depth,
+                     Label* miss);
 
   // Generate code for checking access rights - used for security checks
   // on access to global objects across environments. The holder register