softgpu: Detect binner alloc fail and bail.

GPU/Software/TransformUnit.cpp

@@ -42,6 +42,8 @@
 
 TransformUnit::TransformUnit() {
 	decoded_ = (u8 *)AllocateMemoryPages(TRANSFORM_BUF_SIZE, MEM_PROT_READ | MEM_PROT_WRITE);
+	if (!decoded_)
+		return;
 	binner_ = new BinManager();
 }
 
@@ -50,6 +52,10 @@ TransformUnit::~TransformUnit() {
 	delete binner_;
 }
 
+bool TransformUnit::IsStarted() {
+	return binner_ && decoded_;
+}
+
 SoftwareDrawEngine::SoftwareDrawEngine() {
 	// All this is a LOT of memory, need to see if we can cut down somehow.  Used for splines.
 	decoded = (u8 *)AllocateMemoryPages(DECODED_VERTEX_BUFFER_SIZE, MEM_PROT_READ | MEM_PROT_WRITE);