SPU LLVM: Postpone runtime worker threads init

They may not be active at all unless a ps3 application is booted.

rpcs3/Emu/Cell/SPUCommonRecompiler.cpp

@@ -4495,11 +4495,10 @@ struct spu_llvm_worker
 	void operator()()
 	{
 		// SPU LLVM Recompiler instance
-		const auto compiler = spu_recompiler_base::make_llvm_recompiler();
-		compiler->init();
+		std::unique_ptr<spu_recompiler_base> compiler;
 
 		// Fake LS
-		std::vector<be_t<u32>> ls(0x10000);
+		std::vector<be_t<u32>> ls;
 
 		bool set_relax_flag = false;
 
@@ -4542,6 +4541,15 @@ struct spu_llvm_worker
 				break;
 			}
 
+			if (!compiler)
+			{
+				// Postponed initialization
+				compiler = spu_recompiler_base::make_llvm_recompiler();
+				compiler->init();
+
+				ls.resize(SPU_LS_SIZE / sizeof(be_t<u32>));
+			}
+
 			if (!set_relax_flag)
 			{
 				spu_thread::g_spu_work_count++;
@@ -4624,6 +4632,17 @@ struct spu_llvm
 			return;
 		}
 
+		while (!registered && thread_ctrl::state() != thread_state::aborting)
+		{
+			// Wait for the first SPU block before launching any thread
+			thread_ctrl::wait_on(utils::bless<atomic_t<u32>>(&registered)[1], 0);
+		}
+
+		if (thread_ctrl::state() == thread_state::aborting)
+		{
+			return;
+		}
+
 		// To compile (hash -> item)
 		std::unordered_multimap<u64, spu_item*, value_hash<u64>> enqueued;