ARM: Implement memcpy using NEON.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index baacf5226ed567e48a92e677afe7d0a82c567bf3..f00e676dde9866b9eb7bb2005d80ed4766da46a2 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -89,12 +89,6 @@ namespace internal {
 #elif defined(__ARMEL__)
 #define V8_HOST_ARCH_ARM 1
 #define V8_HOST_ARCH_32_BIT 1
-// Some CPU-OS combinations allow unaligned access on ARM. We assume
-// that unaligned accesses are not allowed unless the build system
-// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
-#if CAN_USE_UNALIGNED_ACCESSES
-#define V8_HOST_CAN_READ_UNALIGNED 1
-#endif
 #elif defined(__MIPSEL__)
 #define V8_HOST_ARCH_MIPS 1
 #define V8_HOST_ARCH_32_BIT 1
@@ -102,6 +96,16 @@ 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
+
+
 // 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.