[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 7d5a16b47171f7a55ed0e35cb7de7af40d487feb..574c3dbb6efa7a17c96b21b54c2831a62f2ce35b 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -2826,13 +2826,8 @@ void FullCodeGenerator::EmitStringCharCodeAt(CallRuntime* expr) {
   Label need_conversion;
   Label index_out_of_range;
   Label done;
-  StringCharCodeAtGenerator generator(object,
-                                      index,
-                                      result,
-                                      &need_conversion,
-                                      &need_conversion,
-                                      &index_out_of_range,
-                                      STRING_INDEX_IS_NUMBER);
+  StringCharCodeAtGenerator generator(object, index, result, &need_conversion,
+                                      &need_conversion, &index_out_of_range);
   generator.GenerateFast(masm_);
   __ jmp(&done);