ssa: binop check shl/shr

internal/runtime/error.go

@@ -0,0 +1,15 @@
+package runtime
+
+type errorString string
+
+func (e errorString) RuntimeError() {}
+
+func (e errorString) Error() string {
+	return "runtime error: " + string(e)
+}
+
+func CheckRuntimeError(b bool, s string) {
+	if b {
+		panic(errorString(s).Error())
+	}
+}