MIPS64: Add big-endian support for mips64.

build/toolchain.gypi

Index: build/toolchain.gypi
diff --git a/build/toolchain.gypi b/build/toolchain.gypi
index 2163171d7e55a01f6d79beaa489a87f7f0175a58..bd081e179107cc79cefe4e90e1ef6a10b140fd24 100644
--- a/build/toolchain.gypi
+++ b/build/toolchain.gypi
@@ -341,7 +341,8 @@
         'cflags': ['-march=i586'],
       }],  # v8_target_arch=="x87"
       ['(v8_target_arch=="mips" or v8_target_arch=="mipsel" \
-        or v8_target_arch=="mips64el") and v8_target_arch==target_arch', {
+        or v8_target_arch=="mips64" or v8_target_arch=="mips64el") \
+         and v8_target_arch==target_arch', {
         'target_conditions': [
           ['_toolset=="target"', {
             # Target built with a Mips CXX compiler.
@@ -743,7 +744,7 @@
           }],
         ],
       }],  # v8_target_arch=="mipsel"
-      ['v8_target_arch=="mips64el"', {
+      ['v8_target_arch=="mips64el" or v8_target_arch=="mips64"', {
         'defines': [
           'V8_TARGET_ARCH_MIPS64',
         ],
@@ -753,6 +754,16 @@
               'CAN_USE_FPU_INSTRUCTIONS',
             ],
           }],
+          [ 'v8_host_byteorder=="little"', {
+            'defines': [
+              'V8_TARGET_ARCH_MIPS64_LE',
+            ],
+          }],
+          [ 'v8_host_byteorder=="big"', {
+            'defines': [
+              'V8_TARGET_ARCH_MIPS64_BE',
+            ],
+          }],
           [ 'v8_use_mips_abi_hardfloat=="true"', {
             'defines': [
               '__mips_hard_float=1',
@@ -769,11 +780,17 @@
             'conditions': [
               ['v8_target_arch==target_arch', {
                 'cflags': [
-                  '-EL',
                   '-Wno-error=array-bounds',  # Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273
                 ],
-                'ldflags': ['-EL'],
                 'conditions': [
+                  ['v8_target_arch=="mips64el"', {
+                    'cflags': ['-EL'],
+                    'ldflags': ['-EL'],
+                  }],
+                  ['v8_target_arch=="mips64"', {
+                    'cflags': ['-EB'],
+                    'ldflags': ['-EB'],
+                  }],
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],