[compiler] Introduce code stubs for string relational comparisons.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index bac3c1e0df21a624b99affa2b1cbb94fbc0652b3..b9df93364fdafbb0e8e8193f76ada0d0035dda0f 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -2864,44 +2864,6 @@ void StringHelper::GenerateOneByteCharsCompareLoop(
 }
 
 
-void StringCompareStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- edx    : left string
-  //  -- eax    : right string
-  //  -- esp[0] : return address
-  // -----------------------------------
-  __ AssertString(edx);
-  __ AssertString(eax);
-
-  Label not_same;
-  __ cmp(edx, eax);
-  __ j(not_equal, &not_same, Label::kNear);
-  __ Move(eax, Immediate(Smi::FromInt(EQUAL)));
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1);
-  __ Ret();
-
-  __ bind(&not_same);
-
-  // Check that both objects are sequential one-byte strings.
-  Label runtime;
-  __ JumpIfNotBothSequentialOneByteStrings(edx, eax, ecx, ebx, &runtime);
-
-  // Compare flat one-byte strings.
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1);
-  StringHelper::GenerateCompareFlatOneByteStrings(masm, edx, eax, ecx, ebx,
-                                                  edi);
-
-  // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
-  // tagged as a small integer.
-  __ bind(&runtime);
-  __ PopReturnAddressTo(ecx);
-  __ Push(edx);
-  __ Push(eax);
-  __ PushReturnAddressFrom(ecx);
-  __ TailCallRuntime(Runtime::kStringCompare);
-}
-
-
 void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- edx    : left