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

src/crankshaft/s390/lithium-codegen-s390.cc

Index: src/crankshaft/s390/lithium-codegen-s390.cc
diff --git a/src/crankshaft/s390/lithium-codegen-s390.cc b/src/crankshaft/s390/lithium-codegen-s390.cc
index 8c659de7e771b42ccc5977811f72e596e5163670..32ac576b8e1a5b4627935a2956ec22d6de7120f7 100644
--- a/src/crankshaft/s390/lithium-codegen-s390.cc
+++ b/src/crankshaft/s390/lithium-codegen-s390.cc
@@ -5190,17 +5190,6 @@ void LCodeGen::DoClampTToUint8(LClampTToUint8* instr) {
   __ bind(&done);
 }
 
-void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
-  DoubleRegister value_reg = ToDoubleRegister(instr->value());
-  Register result_reg = ToRegister(instr->result());
-  __ lgdr(result_reg, value_reg);
-  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
-    __ srlg(result_reg, result_reg, Operand(32));
-  } else {
-    __ llgfr(result_reg, result_reg);
-  }
-}
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate final : public LDeferredCode {
    public: