Replace some calls to MemCopy with small constant sizes with memcpy

src/arm/assembler-arm.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 2307 matching lines @@
   int sd, d;
   first.split_code(&sd, &d);
   int count = last.code() - first.code() + 1;
   emit(cond | B27 | B26 | am | d*B22 | base.code()*B16 | sd*B12 |
        0xA*B8 | count);
 }
 
 
 static void DoubleAsTwoUInt32(double d, uint32_t* lo, uint32_t* hi) {
   uint64_t i;
-  MemCopy(&i, &d, 8);
+  memcpy(&i, &d, 8);
 
   *lo = i & 0xffffffff;
   *hi = i >> 32;
 }
 
 
 // Only works for little endian floating point formats.
 // We don't support VFP on the mixed endian floating point platform.
 static bool FitsVMOVDoubleImmediate(double d, uint32_t *encoding) {
   ASSERT(CpuFeatures::IsSupported(VFP3));
@@ skipping 1314 matching lines @@
   ASSERT((index_64bit == count_of_64bit_) &&
          (index_code_ptr == (index_64bit + count_of_code_ptr_)) &&
          (index_heap_ptr == (index_code_ptr + count_of_heap_ptr_)) &&
          (index_32bit == (index_heap_ptr + count_of_32bit_)));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM