Revert "[SAB] Move Atomics builtins to C++"

src/v8.gyp

Index: src/v8.gyp
diff --git a/src/v8.gyp b/src/v8.gyp
index 283e41762030acf32a5b911385e37464e1b735ff..144f48285302d3f5a918488b96c5ad8343f70bef 100644
--- a/src/v8.gyp
+++ b/src/v8.gyp
@@ -171,6 +171,7 @@
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
+        '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/experimental-extras-libraries.cc',
         '<(INTERMEDIATE_DIR)/snapshot.cc',
@@ -229,6 +230,7 @@
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
+        '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/extras-libraries.cc',
         '<(SHARED_INTERMEDIATE_DIR)/experimental-extras-libraries.cc',
         'snapshot/snapshot-empty.cc',
@@ -2204,6 +2206,7 @@
             'inputs': [
               '../tools/concatenate-files.py',
               '<(SHARED_INTERMEDIATE_DIR)/libraries.bin',
+              '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental.bin',
               '<(SHARED_INTERMEDIATE_DIR)/libraries-extras.bin',
               '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental-extras.bin',
             ],
@@ -2278,7 +2281,13 @@
           'debug/debug.js',
           'debug/liveedit.js',
         ],
+        'experimental_library_files': [
+          'js/macros.py',
+          'messages.h',
+          'js/harmony-atomics.js',
+        ],
         'libraries_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries.bin',
+        'libraries_experimental_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental.bin',
         'libraries_extras_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-extras.bin',
         'libraries_experimental_extras_bin_file': '<(SHARED_INTERMEDIATE_DIR)/libraries-experimental-extras.bin',
         'conditions': [
@@ -2321,6 +2330,38 @@
           ],
         },
         {
+          'action_name': 'js2c_experimental',
+          'inputs': [
+            '../tools/js2c.py',
+            '<@(experimental_library_files)',
+          ],
+          'outputs': ['<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc'],
+          'action': [
+            'python',
+            '../tools/js2c.py',
+            '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
+            'EXPERIMENTAL',
+            '<@(experimental_library_files)',
+          ],
+        },
+        {
+          'action_name': 'js2c_experimental_bin',
+          'inputs': [
+            '../tools/js2c.py',
+            '<@(experimental_library_files)',
+          ],
+          'outputs': ['<@(libraries_experimental_bin_file)'],
+          'action': [
+            'python',
+            '../tools/js2c.py',
+            '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
+            'EXPERIMENTAL',
+            '<@(experimental_library_files)',
+            '--startup_blob', '<@(libraries_experimental_bin_file)',
+            '--nojs',
+          ],
+        },
+        {
           'action_name': 'js2c_extras',
           'inputs': [
             '../tools/js2c.py',