fix(cmd/gasm): probe the loong64 sc.q operand order in the encodability battery

Assisted-by: GLM 5.3

cmd/gasm/audit.go

@@ -342,6 +342,9 @@ func probeShapes(a arch.Arch) []string {
 			// hint, and the byte-shuffle quads.
 			"$1, $0", "R1, R5, 0", "0(R7), $5, $0", "(R7), $5, $0",
 			"V1, V2, V3, V4", "X1, X2, X3, X4",
+			// SCQ (sc.q) keeps its own three-operand order: value,
+			// scratch, memory base.
+			"R4, R5, (R6)",
 			"",
 		}
 	}