Speed up A64 simulator by removing useless memcpy.

src/a64/instructions-a64.h

Index: src/a64/instructions-a64.h
diff --git a/src/a64/instructions-a64.h b/src/a64/instructions-a64.h
index f4bdbbf554bc2b27dae1bea9ff94b38e7e3df6cd..ccab39e3ac84e18f4c85b35cce2abdf171e78b40 100644
--- a/src/a64/instructions-a64.h
+++ b/src/a64/instructions-a64.h
@@ -119,14 +119,12 @@ enum Reg31Mode {
 
 class Instruction {
  public:
-  Instr InstructionBits() const {
-    Instr bits;
-    memcpy(&bits, this, sizeof(bits));
-    return bits;
+  V8_INLINE Instr InstructionBits() const {
+    return *reinterpret_cast<const Instr*>(this);
   }
 
-  void SetInstructionBits(Instr new_instr) {
-    memcpy(this, &new_instr, sizeof(new_instr));
+  V8_INLINE void SetInstructionBits(Instr new_instr) {
+    *reinterpret_cast<Instr*>(this) = new_instr;
   }
 
   int Bit(int pos) const {
@@ -369,28 +367,6 @@ class Instruction {
     return reinterpret_cast<uint8_t*>(this) + offset;
   }
 
-  uint32_t Literal32() {
-    uint32_t literal;
-    memcpy(&literal, LiteralAddress(), sizeof(literal));
-
-    return literal;
-  }
-
-  uint64_t Literal64() {
-    uint64_t literal;
-    memcpy(&literal, LiteralAddress(), sizeof(literal));
-
-    return literal;
-  }
-
-  float LiteralFP32() {
-    return rawbits_to_float(Literal32());
-  }
-
-  double LiteralFP64() {
-    return rawbits_to_double(Literal64());
-  }
-
   Instruction* NextInstruction() {
     return this + kInstructionSize;
   }