[intrinsics] Remove the %_IsDate intrinsic.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 2b7cfd3ad7f9d32b12c25b4f1783159274208bd8..232dd27c4c7e8b2b0977e10ca61bae7b538329ba 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -3065,28 +3065,6 @@ void FullCodeGenerator::EmitValueOf(CallRuntime* expr) {
 }
 
 
-void FullCodeGenerator::EmitIsDate(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK_EQ(1, args->length());
-
-  VisitForAccumulatorValue(args->at(0));
-
-  Label materialize_true, materialize_false;
-  Label* if_true = nullptr;
-  Label* if_false = nullptr;
-  Label* fall_through = nullptr;
-  context()->PrepareTest(&materialize_true, &materialize_false, &if_true,
-                         &if_false, &fall_through);
-
-  __ JumpIfSmi(eax, if_false);
-  __ CmpObjectType(eax, JS_DATE_TYPE, ebx);
-  PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
-  Split(equal, if_true, if_false, fall_through);
-
-  context()->Plug(if_true, if_false);
-}
-
-
 void FullCodeGenerator::EmitOneByteSeqStringSetChar(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_EQ(3, args->length());