ARM: Implement memcpy using NEON.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 573e19a03ddce49e2324a1820a1b76d33e4425ac..5a5fb4e03ea9931a8e9e786bcfdf92e76ac53c9b 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -102,6 +102,32 @@ namespace internal {
 #error Host architecture was not detected as supported by v8
 #endif
 
+#if defined(__ARM_ARCH_7A__) || \
+    defined(__ARM_ARCH_7R__) || \
+    defined(__ARM_ARCH_7__)
+# define CAN_USE_ARMV7_INSTRUCTIONS 1
+# ifndef CAN_USE_VFP3_INSTRUCTIONS
+#  define CAN_USE_VFP3_INSTRUCTIONS
+# endif
+#endif
+
+
+#ifdef V8_TARGET_ARCH_ARM
+// Simulator should support unaligned access by default.
+#if !defined(__arm__)
+# ifndef V8_HOST_CAN_READ_UNALIGNED
+#  define V8_HOST_CAN_READ_UNALIGNED
+# endif
+#endif
+
+#if defined(CAN_USE_ARMV7_INSTRUCTIONS)
+# ifndef V8_HOST_CAN_READ_UNALIGNED
+#  define V8_HOST_CAN_READ_UNALIGNED
+# endif
+#endif
+#endif
+
+
 // Target architecture detection. This may be set externally. If not, detect
 // in the same way as the host architecture, that is, target the native
 // environment as presented by the compiler.