Add support for the QNX operating system.

src/arm/cpu-arm.cc

Index: src/arm/cpu-arm.cc
diff --git a/src/arm/cpu-arm.cc b/src/arm/cpu-arm.cc
index cf531e1292bd8e4e7c1fa2e3e551b5167354a78f..20c6a5dcce31e4e002afa0882bc62467baaf82a9 100644
--- a/src/arm/cpu-arm.cc
+++ b/src/arm/cpu-arm.cc
@@ -27,8 +27,13 @@
 
 // CPU specific code for arm independent of OS goes here.
 #ifdef __arm__
+#ifdef __QNXNTO__
+#include <sys/mman.h>  // for cache flushing.
+#undef MAP_TYPE
+#else
 #include <sys/syscall.h>  // for cache flushing.
 #endif
+#endif
 
 #include "v8.h"
 
@@ -57,13 +62,15 @@ void CPU::FlushICache(void* start, size_t size) {
     return;
   }
 
-#if defined (USE_SIMULATOR)
+#if defined(USE_SIMULATOR)
   // Not generating ARM instructions for C-code. This means that we are
   // building an ARM emulator based target.  We should notify the simulator
   // that the Icache was flushed.
   // None of this code ends up in the snapshot so there are no issues
   // around whether or not to generate the code when building snapshots.
   Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), start, size);
+#elif V8_OS_QNX
+  msync(start, size, MS_SYNC | MS_INVALIDATE_ICACHE);
 #else
   // Ideally, we would call
   //   syscall(__ARM_NR_cacheflush, start,