Revert r9901 to make tree green again.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
===================================================================
--- src/x64/lithium-codegen-x64.cc	(revision 9901)
+++ src/x64/lithium-codegen-x64.cc	(working copy)
@@ -1680,31 +1680,6 @@
 }
 
 
-Condition LCodeGen::EmitIsString(Register input,
-                                 Label* is_not_string,
-                                 Label* is_string) {
-
-  __ JumpIfSmi(input, is_not_string);
-  __ CmpObjectType(input, FIRST_NONSTRING_TYPE, rcx);
-
-  return below;
-}
-
-
-void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
-  Register reg = ToRegister(instr->InputAt(0));
-
-  int true_block = chunk_->LookupDestination(instr->true_block_id());
-  int false_block = chunk_->LookupDestination(instr->false_block_id());
-  Label* true_label = chunk_->GetAssemblyLabel(true_block);
-  Label* false_label = chunk_->GetAssemblyLabel(false_block);
-
-  Condition true_cond = EmitIsString(reg, false_label, true_label);
-
-  EmitBranch(true_block, false_block, true_cond);
-}
-
-
 void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
   int true_block = chunk_->LookupDestination(instr->true_block_id());
   int false_block = chunk_->LookupDestination(instr->false_block_id());
@@ -1736,21 +1711,6 @@
 }
 
 
-void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
-  Token::Value op = instr->op();
-  int true_block = chunk_->LookupDestination(instr->true_block_id());
-  int false_block = chunk_->LookupDestination(instr->false_block_id());
-
-  Handle<Code> ic = CompareIC::GetUninitialized(op);
-  CallCode(ic, RelocInfo::CODE_TARGET, instr);
-
-  Condition condition = TokenToCondition(op, false);
-  __ testq(rax, rax);
-
-  EmitBranch(true_block, false_block, condition);
-}
-
-
 static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
   InstanceType from = instr->from();
   InstanceType to = instr->to();