PPC: [builtins] Simplify String constructor code.

src/ppc/macro-assembler-ppc.h

Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index af82d2400245471f3442405a5e891053391d6d22..384bc1581c7243261bb9302943d1f1bfacf5c896 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -1326,15 +1326,6 @@ class MacroAssembler : public Assembler {
   // ---------------------------------------------------------------------------
   // String utilities
 
-  // Generate code to do a lookup in the number string cache. If the number in
-  // the register object is found in the cache the generated code falls through
-  // with the result in the result register. The object and the result register
-  // can be the same. If the number is not found in the cache the code jumps to
-  // the label not_found with only the content of register object unchanged.
-  void LookupNumberStringCache(Register object, Register result,
-                               Register scratch1, Register scratch2,
-                               Register scratch3, Label* not_found);
-
   // Checks if both objects are sequential one-byte strings and jumps to label
   // if either is not. Assumes that neither object is a smi.
   void JumpIfNonSmisNotBothSequentialOneByteStrings(Register object1,