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

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

Index: src/crankshaft/ppc/lithium-codegen-ppc.cc
diff --git a/src/crankshaft/ppc/lithium-codegen-ppc.cc b/src/crankshaft/ppc/lithium-codegen-ppc.cc
index 0832f7ed4ddeb6782c34c56fcc970b011feb067f..a111e017e0b4cf74c54800582b6664894128963d 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -5292,18 +5292,6 @@ void LCodeGen::DoClampTToUint8(LClampTToUint8* instr) {
 }
 
 
-void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
-  DoubleRegister value_reg = ToDoubleRegister(instr->value());
-  Register result_reg = ToRegister(instr->result());
-
-  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
-    __ MovDoubleHighToInt(result_reg, value_reg);
-  } else {
-    __ MovDoubleLowToInt(result_reg, value_reg);
-  }
-}
-
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate final : public LDeferredCode {
    public: