ARM: Enable the subnormal floats on QNX.

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index acb4f9498669bb7da41c6dc2f831a75511bb63aa..b5a41e0f9aa2a85b73c1b0902e8e1ac0ab2dac43 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -311,6 +311,9 @@ class OS {
   // Returns the double constant NAN
   static double nan_value();
 
+  // Enable the subnormal float support on ARM CPUs.
+  static void ArmEnableSubnormalFloat();
+
   // Support runtime detection of whether the hard float option of the
   // EABI is used.
   static bool ArmUsingHardFloat();