fix(lint): calibrate register-clobber to the Go ABI and add legacy SSE moves

Assisted-by: Qwen 3.8 Max Preview

lint/lint_test.go

@@ -48,11 +48,11 @@ func TestFixtureIsClean(t *testing.T) {
 	if len(errs) > 0 {
 		t.Fatalf("parse: %v", errs)
 	}
-	// The fixture mirrors the go-flac kernels, which use callee-saved registers
-	// (BX, R13) without saving them; the register-clobber audit flags that by
-	// design.  This test targets the other rules, so the audit is disabled here
-	// (it is covered by TestRegisterClobber).
-	diags := File(f, Config{Arch: arch.AMD64, Disable: map[string]bool{CodeRegisterClobber: true}})
+	// The fixture mirrors the go-flac kernels, which write the Go ABI0
+	// scratch registers (BX, R13) without saving them — legal under Go's
+	// stack-based ABI, so the register-clobber audit stays silent and the
+	// fixture must lint entirely clean.
+	diags := File(f, Config{Arch: arch.AMD64})
 	if len(diags) != 0 {
 		t.Fatalf("expected no diagnostics on the fixture, got %+v", diags)
 	}