Add "JIT Enabled" property in HermesInternal.getRuntimeProperties()

Summary: This makes it easier to tell whether JIT is enabled.

Reviewed By: avp

Differential Revision: D88092036

fbshipit-source-id: 9da5f88ff557095e5bde5f72d76ebbc4906a3c73

Author: lavenzg

lib/VM/JSLib/HermesInternal.cpp

@@ -273,6 +273,14 @@ CallResult<HermesValue> hermesInternalGetRuntimeProperties(
     return ExecutionStatus::EXCEPTION;
   }
 
+  lv.tmpHandle =
+      HermesValue::encodeBoolValue(runtime.getJITContext().isEnabled());
+  if (LLVM_UNLIKELY(
+          addProperty(lv.tmpHandle, "JIT Enabled") ==
+          ExecutionStatus::EXCEPTION)) {
+    return ExecutionStatus::EXCEPTION;
+  }
+
   lv.tmpHandle = HermesValue::encodeBoolValue(runtime.builtinsAreFrozen());
   if (LLVM_UNLIKELY(
           addProperty(lv.tmpHandle, "Builtins Frozen") ==