Merge experimental/a64 to bleeding_edge.

build/toolchain.gypi

Index: build/toolchain.gypi
diff --git a/build/toolchain.gypi b/build/toolchain.gypi
index badac265159210ae4e117b5a0b5383c2a5b49635..c2a33007334a829ccab0d3bb9992628f40e091dc 100644
--- a/build/toolchain.gypi
+++ b/build/toolchain.gypi
@@ -268,6 +268,11 @@
           }],  # _toolset=="target"
         ],
       }],  # v8_target_arch=="arm"
+      ['v8_target_arch=="a64"', {
+        'defines': [
+          'V8_TARGET_ARCH_A64',
+        ],
+      }],
       ['v8_target_arch=="ia32"', {
         'defines': [
           'V8_TARGET_ARCH_IA32',
@@ -407,7 +412,8 @@
           }],
         ],
       }],
-      ['(OS=="linux") and (v8_target_arch=="x64")', {
+      ['(OS=="linux" or OS=="android") and \
+        (v8_target_arch=="x64" or v8_target_arch=="a64")', {
         # Check whether the host compiler and target compiler support the
         # '-m64' option and set it if so.
         'target_conditions': [
@@ -513,7 +519,8 @@
             OS=="qnx"', {
             'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual',
-                        '<(wno_array_bounds)' ],
+                        '<(wno_array_bounds)',
+                      ],
             'conditions': [
               ['v8_optimized_debug==0', {
                 'cflags!': [