[builtins] Simplify String constructor code.

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 f57bdb7e866eb62bb23d76216f02e7c8b6b3ad21..2a2338dc07f20b3cca39bfdab6531baa3d64db7d 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -923,17 +923,6 @@ 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,
-                               Label* not_found);
-
   // Check whether the instance type represents a flat one-byte string. Jump to
   // the label if not. If the instance type can be scratched specify same
   // register for both instance type and scratch.