[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index 00f51e5fec2b9afda20f232a8fb3b68854acf978..2256728672591f68c53e7de09c6afbeeef586614 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -2943,13 +2943,8 @@ 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);