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

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index b79d787b1d4d4d2afad8c2ad43c6d14078a40622..8388c4e0ae392d29c29bdd2d2504809dcd24f0c0 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -5079,18 +5079,6 @@ void LCodeGen::DoClampTToUint8(LClampTToUint8* instr) {
 }
 
 
-void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
-  XMMRegister value_reg = ToDoubleRegister(instr->value());
-  Register result_reg = ToRegister(instr->result());
-  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
-    __ Movq(result_reg, value_reg);
-    __ shrq(result_reg, Immediate(32));
-  } else {
-    __ Movd(result_reg, value_reg);
-  }
-}
-
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate final : public LDeferredCode {
    public: