Fix build on PPC64LE

Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>

src/nvcore/Debug.h

@@ -166,7 +166,7 @@ NVCORE_API void NV_CDECL nvDebugPrint( const char *msg, ... ) __attribute__((for
 namespace nv
 {
     inline bool isValidPtr(const void * ptr) {
-    #if NV_CPU_X86_64
+    #if NV_CPU_X86_64 || POSH_CPU_PPC64
         if (ptr == NULL) return true;
         if (reinterpret_cast<uint64>(ptr) < 0x10000ULL) return false;
         if (reinterpret_cast<uint64>(ptr) >= 0x000007FFFFFEFFFFULL) return false;