Get rid of HStringLength.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 7edf2d9f3e0a4148c047da290fbd38c9fb35af9a..2fa038baa49736ea188662e1a876d2cc68bb16b3 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2514,12 +2514,6 @@ LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
-  LOperand* string = UseRegisterAtStart(instr->value());
-  return DefineAsRegister(new(zone()) LStringLength(string));
-}
-
-
 LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
   info()->MarkAsDeferredCalling();
   LOperand* context = UseAny(instr->context());