[deoptimizer] Preserve double bit patterns correctly.

src/ppc/deoptimizer-ppc.cc

Index: src/ppc/deoptimizer-ppc.cc
diff --git a/src/ppc/deoptimizer-ppc.cc b/src/ppc/deoptimizer-ppc.cc
index 39102a1ef0b353dcbfa3f4c2052a132b0cf41cb6..b96dc6fece90e3d9de6d8d0ce02b582d6732b300 100644
--- a/src/ppc/deoptimizer-ppc.cc
+++ b/src/ppc/deoptimizer-ppc.cc
@@ -101,7 +101,7 @@ void Deoptimizer::SetPlatformCompiledStubRegisters(
 
 void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
   for (int i = 0; i < DoubleRegister::kNumRegisters; ++i) {
-    double double_value = input_->GetDoubleRegister(i);
+    Float64 double_value = input_->GetDoubleRegister(i);
     output_frame->SetDoubleRegister(i, double_value);
   }
 }