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

src/crankshaft/ppc/lithium-ppc.h

Index: src/crankshaft/ppc/lithium-ppc.h
diff --git a/src/crankshaft/ppc/lithium-ppc.h b/src/crankshaft/ppc/lithium-ppc.h
index f5e11e3fc370dd5585702310b96ad7476742fa30..82afa6a6bb93acc1ce0d236acdc5fc4a0c0a5f8f 100644
--- a/src/crankshaft/ppc/lithium-ppc.h
+++ b/src/crankshaft/ppc/lithium-ppc.h
@@ -60,7 +60,6 @@ class LCodeGen;
   V(DivByConstI)                             \
   V(DivByPowerOf2I)                          \
   V(DivI)                                    \
-  V(DoubleBits)                              \
   V(DoubleToI)                               \
   V(DoubleToSmi)                             \
   V(Drop)                                    \
@@ -2263,17 +2262,6 @@ 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, LOperand* size, LOperand* temp1,