A64: Replace memcpy with reinterpret_cast assignment in simulator and decoder.

src/a64/simulator-a64.h

Index: src/a64/simulator-a64.h
diff --git a/src/a64/simulator-a64.h b/src/a64/simulator-a64.h
index 535f287096a317e9ce157b17c033f2184399d0ed..beac0c8f7546694c89f2d2e5a30a89e2ef6283a3 100644
--- a/src/a64/simulator-a64.h
+++ b/src/a64/simulator-a64.h
@@ -321,7 +321,7 @@ class Simulator : public DecoderVisitor {
   template <typename T>
   void set_pc(T new_pc) {
     ASSERT(sizeof(T) == sizeof(pc_));
-    memcpy(&pc_, &new_pc, sizeof(T));
+    *reinterpret_cast<T*>(&pc_) = new_pc;
     pc_modified_ = true;
   }
   Instruction* pc() { return pc_; }