[builtins] Simplify String constructor code.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index d0f770499c0ad348b1e18e224015e7aac86bb2f7..8bb573f65eee82acef9610c3dd6c08fda373f867 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -164,6 +164,7 @@ class MacroAssembler: public Assembler {
   void Pop(Register dst) { pop(dst); }
 
   // Register move. May do nothing if the registers are identical.
+  void Move(Register dst, Smi* smi) { mov(dst, Operand(smi)); }
   void Move(Register dst, Handle<Object> value);
   void Move(Register dst, Register src, Condition cond = al);
   void Move(Register dst, const Operand& src, SBit sbit = LeaveCC,
@@ -1329,18 +1330,6 @@ 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,