More PAL related changes required for restricted platforms. (#4037)

Signed-off-by: bosnichd <bosnichd@amazon.com>

Code/Framework/AzCore/Platform/Common/WinAPI/AzCore/std/parallel/internal/thread_WinAPI.cpp

@@ -15,7 +15,7 @@ namespace AZStd
 {
     namespace Platform
     {
-        void PostThreadRun();
+        unsigned __stdcall PostThreadRun();
         HANDLE CreateThread(unsigned stackSize, unsigned (__stdcall* threadRunFunction)(void*), AZStd::Internal::thread_info* ti, unsigned int* id);
         unsigned HardwareConcurrency();
         void SetThreadName(HANDLE hThread, const char* threadName);
@@ -40,9 +40,7 @@ namespace AZStd
             ThreadEventBus::Broadcast(&ThreadEventBus::Events::OnThreadExit, this_thread::get_id()); // goes to client listeners
             ThreadDrillerEventBus::Broadcast(&ThreadDrillerEventBus::Events::OnThreadExit, this_thread::get_id()); // goes to the profiler.
 
-            Platform::PostThreadRun();
-
-            return 0;
+            return Platform::PostThreadRun();
         }
 
         /**

Code/Framework/AzCore/Platform/Windows/AzCore/std/parallel/internal/thread_Windows.cpp

@@ -16,9 +16,10 @@ namespace AZStd
 {
     namespace Platform
     {
-        void PostThreadRun()
+        unsigned __stdcall PostThreadRun()
         {
             _endthreadex(0);
+            return 0;
         }
 
         HANDLE CreateThread(unsigned stackSize, unsigned (__stdcall* threadRunFunction)(void*), AZStd::Internal::thread_info* ti, unsigned int* id)

Gems/Atom/RHI/DX12/Code/Source/Platform/Windows/RHI/Device_Windows.cpp

@@ -325,5 +325,10 @@ namespace AZ
 
             return formatsList;
         }
+
+        void Device::BeginFrameInternal()
+        {
+            m_commandQueueContext.Begin();
+        }
     }
 }

Gems/Atom/RHI/DX12/Code/Source/RHI/Device.cpp

@@ -189,11 +189,6 @@ namespace AZ
             m_commandQueueContext.UpdateCpuTimingStatistics(cpuTimingStatistics);
         }
 
-        void Device::BeginFrameInternal()
-        {
-            m_commandQueueContext.Begin();
-        }
-
         void Device::EndFrameInternal()
         {
             AZ_TRACE_METHOD();

Gems/Atom/RHI/DX12/Code/Source/RHI/PipelineLibrary.cpp

@@ -262,7 +262,11 @@ namespace AZ
 
         bool PipelineLibrary::IsMergeRequired() const
         {
+#if defined (AZ_DX12_USE_PIPELINE_LIBRARY)
             return !m_pipelineStates.empty();
+#else
+            return false;
+#endif
         }
     }
 }