[intrinsics] Drop the now obsolete %_DoubleHi and %_DoubleLo intrinsics.

src/crankshaft/s390/lithium-s390.cc

Index: src/crankshaft/s390/lithium-s390.cc
diff --git a/src/crankshaft/s390/lithium-s390.cc b/src/crankshaft/s390/lithium-s390.cc
index 033484c70c905b73714388f4caf81e7f3e98f4d6..b2d0d77aaa79c784a6a21ad283c4b7a5302af072 100644
--- a/src/crankshaft/s390/lithium-s390.cc
+++ b/src/crankshaft/s390/lithium-s390.cc
@@ -1787,12 +1787,6 @@ LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
   }
 }
 
-LInstruction* LChunkBuilder::DoDoubleBits(HDoubleBits* instr) {
-  HValue* value = instr->value();
-  DCHECK(value->representation().IsDouble());
-  return DefineAsRegister(new (zone()) LDoubleBits(UseRegister(value)));
-}
-
 LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
   LOperand* context = info()->IsStub() ? UseFixed(instr->context(), cp) : NULL;
   LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());