shader_recompiler: Implement LowerInt16ToInt32

AMD drivers 22.3.2 and later expose a bug in yuzu, where the application
would submit 16-bit integer instructions to GPUs that don't support
16-bit integers, namely GCN 4 devices.

Replace any 16-bit instructions with 32-bit ones so newer AMD drivers
will work with VK_KHR_workgroup_memory_explicit_layout.

src/shader_recompiler/frontend/maxwell/translate_program.cpp

@@ -209,6 +209,9 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
     if (!host_info.support_int64) {
         Optimization::LowerInt64ToInt32(program);
     }
+    if (!host_info.support_int16) {
+        Optimization::LowerInt16ToInt32(program);
+    }
     Optimization::SsaRewritePass(program);
 
     Optimization::ConstantPropagationPass(program);