Revert "shader: preserve raw VCC bits in S_MOV_B64 (#418)"

This reverts commit 6758d67942.

An EXEC pair loses its mask provenance and falls into the raw high-word path. The saved all-ones high word then keeps waterfall branches true and wedges GPU work.

src/graphics/shader/recompiler/ir/Program.cpp

@@ -33,16 +33,12 @@ bool IsRegisterStatePseudo(ValueOpcode opcode) {
 		case ValueOpcode::SetScc:
 		case ValueOpcode::GetExec:
 		case ValueOpcode::SetExec:
-		case ValueOpcode::GetExecMaskTag:
-		case ValueOpcode::SetExecMaskTag:
 		case ValueOpcode::GetExecLo:
 		case ValueOpcode::SetExecLo:
 		case ValueOpcode::GetExecHi:
 		case ValueOpcode::SetExecHi:
 		case ValueOpcode::GetVcc:
 		case ValueOpcode::SetVcc:
-		case ValueOpcode::GetVccMaskValidTag:
-		case ValueOpcode::SetVccMaskValidTag:
 		case ValueOpcode::GetVccLo:
 		case ValueOpcode::SetVccLo:
 		case ValueOpcode::GetVccHi: