Replace some calls to MemCopy with small constant sizes with memcpy

src/arm/constants-arm.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "constants-arm.h"
 
@@ skipping 10 matching lines @@
   //
   // where B = ~b. Only the high 16 bits are affected.
   uint64_t high16;
   high16  = (Bits(17, 16) << 4) | Bits(3, 0);   // xxxxxxxx,xxcdefgh.
   high16 |= (0xff * Bit(18)) << 6;              // xxbbbbbb,bbxxxxxx.
   high16 |= (Bit(18) ^ 1) << 14;                // xBxxxxxx,xxxxxxxx.
   high16 |= Bit(19) << 15;                      // axxxxxxx,xxxxxxxx.
 
   uint64_t imm = high16 << 48;
   double d;
-  MemCopy(&d, &imm, 8);
+  memcpy(&d, &imm, 8);
   return d;
 }
 
 
 // These register names are defined in a way to match the native disassembler
 // formatting. See for example the command "objdump -d <binary file>".
 const char* Registers::names_[kNumRegisters] = {
   "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
   "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc",
 };
@@ skipping 80 matching lines @@
   }
 
   // No register with the requested name found.
   return kNoRegister;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM