x86 validator: Implement rewriting "movntq" to "movq" on x86-64

src/trusted/validator/validation_rewrite_test_data.S

 /*
  * Copyright 2016 The Native Client 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 "native_client/src/include/build_config.h"
 #include "native_client/src/include/nacl_asm.h"
 
 #define GLOBAL_SYM(name) .global IDENTIFIER(name); IDENTIFIER(name):
@@ skipping 81 matching lines @@
     mov %edi,%edi
     nop
     nop
     nop
     nop
     nop
     nop
     nop
 GLOBAL_SYM(prefetchnta_rip_relative_code_post_rewrite_end)
 
+GLOBAL_SYM(movntq_code)
+    mov %ebx,%ebx
+    movntq %mm0,(%r15,%rbx,1)
+GLOBAL_SYM(movntq_code_end)
+
+GLOBAL_SYM(movntq_code_post_rewrite)
+    mov %ebx,%ebx
+    movq %mm0,(%r15,%rbx,1)
+GLOBAL_SYM(movntq_code_post_rewrite_end)
+
 GLOBAL_SYM(movntps_code)
     mov %ebx,%ebx
     movntps %xmm0,(%r15,%rbx,1)
 GLOBAL_SYM(movntps_code_end)
 
 GLOBAL_SYM(movntps_code_post_rewrite)
     mov %ebx,%ebx
     movaps %xmm0,(%r15,%rbx,1)
 GLOBAL_SYM(movntps_code_post_rewrite_end)
 
@@ skipping 107 matching lines @@
     movdqa %xmm15,(%r15,%rcx,1)   /* offset 10, length 6 */
     mov %ecx,%ecx                 /* offset 16, length 2 */
     movdqa %xmm15,(%r15,%rcx,1)   /* offset 18, length 6 */
     nop                           /* offset 24, length 1 */
     mov %edx,%edx                 /* offset 25, length 2 */
     mov %r9d,(%r15,%rdx,1)        /* offset 27, length 4 */
     nop                           /* offset 32, length 1 */
 GLOBAL_SYM(last_movnti_cross_bundle_by_one_post_rewrite_end)
 
 #endif