[runtime] Kill the %NumberToIntegerMapMinusZero runtime entry.

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index edee7942bbe45705bf207bfb7318d70237fdd1c0..630fddbbbd6c172a2f99b27ec61733d5e01ac224 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -1396,7 +1396,6 @@ void LoadIndexedStringStub::Generate(MacroAssembler* masm) {
                                           &miss,  // When not a string.
                                           &miss,  // When not a number.
                                           &miss,  // When index out of range.
-                                          STRING_INDEX_IS_ARRAY_INDEX,
                                           RECEIVER_IS_STRING);
   char_at_generator.GenerateFast(masm);
   __ Ret();
@@ -2228,13 +2227,7 @@ void StringCharCodeAtGenerator::GenerateSlow(
     // index_ is consumed by runtime conversion function.
     __ Push(object_, index_);
   }
-  if (index_flags_ == STRING_INDEX_IS_NUMBER) {
-    __ CallRuntime(Runtime::kNumberToIntegerMapMinusZero);
-  } else {
-    DCHECK(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
-    // NumberToSmi discards numbers that are not exact integers.
-    __ CallRuntime(Runtime::kNumberToSmi);
-  }
+  __ CallRuntime(Runtime::kNumberToSmi);
   // Save the conversion result before the pop instructions below
   // have a chance to overwrite it.
   __ Move(index_, r3);
@@ -2563,7 +2556,7 @@ void SubStringStub::Generate(MacroAssembler* masm) {
   // r6: from index (untagged)
   __ SmiTag(r6, r6);
   StringCharAtGenerator generator(r3, r6, r5, r3, &runtime, &runtime, &runtime,
-                                  STRING_INDEX_IS_NUMBER, RECEIVER_IS_STRING);
+                                  RECEIVER_IS_STRING);
   generator.GenerateFast(masm);
   __ Drop(3);
   __ Ret();