Reduce Windows debugger crashes on shutdown

Core/System.cpp

@@ -550,6 +550,9 @@ bool PSP_IsQuitting() {
 }
 
 void PSP_Shutdown() {
+	// Reduce the risk for weird races with the Windows GE debugger.
+	gpuDebug = nullptr;
+
 	Achievements::UnloadGame();
 
 	// Do nothing if we never inited.

GPU/Common/SoftwareTransformCommon.cpp

@@ -539,9 +539,9 @@ void SoftwareTransform::BuildDrawingParams(int prim, int vertexCount, u32 vertTy
 				// so the operations are exact.
 				bool pixelMapped = true;
 				const u16 *indsIn = (const u16 *)inds;
+				const float uscale = gstate_c.curTextureWidth;
+				const float vscale = gstate_c.curTextureHeight;
 				for (int t = 0; t < vertexCount; t += 3) {
-					float uscale = gstate_c.curTextureWidth;
-					float vscale = gstate_c.curTextureHeight;
 					struct { int a; int b; } pairs[] = { {0, 1}, {1, 2}, {2, 0} };
 					for (int i = 0; i < ARRAY_SIZE(pairs); i++) {
 						int a = indsIn[t + pairs[i].a];

GPU/GPU.cpp

@@ -121,8 +121,6 @@ bool GPU_Init(GraphicsContext *ctx, Draw::DrawContext *draw) {
 #endif
 
 void GPU_Shutdown() {
-	// Reduce the risk for weird races with the Windows GE debugger.
-	gpuDebug = nullptr;
 
 	delete gpu;
 	gpu = nullptr;