Bug 1911021 - Add MOZ_EXECUTION_TRACER compile flag r=arai

Differential Revision: https://phabricator.services.mozilla.com/D222753

js/moz.configure

@@ -419,6 +419,30 @@ set_define("MOZ_PROFILING", profiling)
 imply_option("--enable-vtune", imply_vtune, reason="--enable-profiling")
 
 
+@depends(milestone)
+def enable_execution_tracing(milestone):
+    return milestone.is_nightly
+
+
+option(
+    "--enable-execution-tracing",
+    env="MOZ_EXECUTION_TRACING",
+    default=enable_execution_tracing,
+    help="{Set|Do not set} compile flags necessary for running the JS "
+    "execution tracer",
+)
+
+
+@depends("--enable-execution-tracing")
+def execution_tracing(value):
+    if value:
+        return True
+
+
+set_config("MOZ_EXECUTION_TRACING", execution_tracing)
+set_define("MOZ_EXECUTION_TRACING", execution_tracing)
+
+
 option("--enable-vtune", env="MOZ_VTUNE", help="Enable VTune profiling")