ARM: Enable the subnormal floats on QNX.

src/platform-posix.cc

Index: src/platform-posix.cc
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index 087625a6b5441300a881a0c7c2becd250b092ed6..3915fb3af4b168d898437d83b142fa2278e673f3 100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -606,6 +606,11 @@ static void SetThreadName(const char* name) {
 
 
 static void* ThreadEntry(void* arg) {
+#if V8_OS_QNX && V8_HOST_ARCH_ARM
+  // On QNX/ARM, subnormal float support is a per-thread setting,
+  // disabled by default. Enable it in all new threads.
+  OS::ArmEnableSubnormalFloat();
+#endif
   Thread* thread = reinterpret_cast<Thread*>(arg);
   // This is also initialized by the first argument to pthread_create() but we
   // don't know which thread will run first (the original thread or the new