ARM: Enable the subnormal floats on QNX.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 2739e070b634cac24804eb2e8813a7d451b13fb0..770924f3f5554a4f3f1f62a75e2505bcaa89a37f 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4916,6 +4916,15 @@ class V8_EXPORT V8 {
   static int ContextDisposedNotification();
 
   /**
+   * Performs a per-thread setup. The embedder should invoke this method
+   * in all threads (including the main thread) before V8 is initialized.
+   *
+   * Currently, this method enables the subnormal float support on QNX/ARM.
+   * It is a no-op on all the other platforms.
+   */
+  static void PerformPerThreadSetup();
+
+  /**
    * Initialize the ICU library bundled with V8. The embedder should only
    * invoke this method when using the bundled ICU. Returns true on success.
    *