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

src/crankshaft/mips64/lithium-mips64.h

Index: src/crankshaft/mips64/lithium-mips64.h
diff --git a/src/crankshaft/mips64/lithium-mips64.h b/src/crankshaft/mips64/lithium-mips64.h
index ad3fb87f7c5e6a706e339b9619f2080a20da4df8..91da1768c05e40397cce56be4d743126da9c3bb4 100644
--- a/src/crankshaft/mips64/lithium-mips64.h
+++ b/src/crankshaft/mips64/lithium-mips64.h
@@ -63,7 +63,6 @@ class LCodeGen;
   V(DivByPowerOf2I)                          \
   V(DivI)                                    \
   V(DoubleToI)                               \
-  V(DoubleBits)                              \
   V(DoubleToSmi)                             \
   V(Drop)                                    \
   V(Dummy)                                   \
@@ -2334,19 +2333,6 @@ class LClampTToUint8 final : public LTemplateInstruction<1, 1, 1> {
 };
 
 
-class LDoubleBits final : public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LDoubleBits(LOperand* value) {
-    inputs_[0] = value;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(DoubleBits, "double-bits")
-  DECLARE_HYDROGEN_ACCESSOR(DoubleBits)
-};
-
-
 class LAllocate final : public LTemplateInstruction<1, 2, 2> {
  public:
   LAllocate(LOperand* context,