perf: Make promise stack trace collection opt-in.

src/util.js.c

@@ -683,3 +683,14 @@ bool tf_util_is_mobile()
 {
 	return TF_IS_MOBILE != 0;
 }
+
+uint32_t tf_util_fnv32a(const void* buffer, int length, uint32_t start)
+{
+	uint32_t result = 0x811c9dc5;
+	for (int i = 0; i < length; i++)
+	{
+		result ^= ((const uint8_t*)buffer)[i];
+		result += (result << 1) + (result << 4) + (result << 7) + (result << 8) + (result << 24);
+	}
+	return result;
+}