X87: [builtins] Simplify String constructor code.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 97dbf532dd1403d417d1cb37a8dad2a44c0aadf5..1bae63c7e2d301072f21130bd68c2648459426c2 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -877,17 +877,6 @@ 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.