Revert "Add DoubleTestOp instruction"

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
diff --git a/runtime/vm/intrinsifier_x64.cc b/runtime/vm/intrinsifier_x64.cc
index 08108475335492578189ca6660e31fd0153809b8..cdb11df87889566bef98ccde1b8fa09180d47a1d 100644
--- a/runtime/vm/intrinsifier_x64.cc
+++ b/runtime/vm/intrinsifier_x64.cc
@@ -1434,26 +1434,6 @@ void Intrinsifier::Double_getIsNaN(Assembler* assembler) {
 }
 
 
-void Intrinsifier::Double_getIsInfinite(Assembler* assembler) {
-  Label is_inf, done;
-  __ movq(RAX, Address(RSP, +1 * kWordSize));
-  __ movq(RAX, FieldAddress(RAX, Double::value_offset()));
-  // Mask off the sign.
-  __ AndImmediate(RAX, Immediate(0x7FFFFFFFFFFFFFFFLL));
-  // Compare with +infinity.
-  __ CompareImmediate(RAX, Immediate(0x7FF0000000000000LL));
-  __ j(EQUAL, &is_inf, Assembler::kNearJump);
-  __ LoadObject(RAX, Bool::False());
-  __ jmp(&done);
-
-  __ Bind(&is_inf);
-  __ LoadObject(RAX, Bool::True());
-
-  __ Bind(&done);
-  __ ret();
-}
-
-
 void Intrinsifier::Double_getIsNegative(Assembler* assembler) {
   Label is_false, is_true, is_zero;
   __ movq(RAX, Address(RSP, +1 * kWordSize));