fix(asm): correct RISC-V operand order and complete RVC compression

Assisted-by: DeepSeek V4 Pro

verify/riscv_groundtruth_test.go

@@ -17,7 +17,17 @@ import (
 // relocation fields of static-symbol references are masked before the
 // comparison, since the toolchain leaves them zero for the linker.
 func TestGroundTruthRISCV(t *testing.T) {
-	path := "../testdata/verify/basic_riscv64.s"
+	for _, path := range []string{
+		"../testdata/verify/basic_riscv64.s",
+		"../testdata/verify/rvc_riscv64.s",
+	} {
+		t.Run(path, func(t *testing.T) {
+			testGroundTruthRISCVFile(t, path)
+		})
+	}
+}
+
+func testGroundTruthRISCVFile(t *testing.T, path string) {
 	src, err := os.ReadFile(path)
 	if err != nil {
 		t.Fatalf("read: %v", err)