Fix under-parenthesized macro definitions

Lack of parens in the definitions could cause a statement using these
macros to have unexpected semantics.  In current code no bug is
apparent, but best to fix the definitions to avoid problems down the
line.

Reported-by: Tom Lane
Discussion: https://postgr.es/m/19795.1568400476@sss.pgh.pa.us

src/include/nodes/parsenodes.h

@@ -3312,8 +3312,8 @@ typedef struct ConstraintsSetStmt
  */
 
 /* Reindex options */
-#define REINDEXOPT_VERBOSE 1 << 0	/* print progress info */
-#define REINDEXOPT_REPORT_PROGRESS 1 << 1	/* report pgstat progress */
+#define REINDEXOPT_VERBOSE (1 << 0)	/* print progress info */
+#define REINDEXOPT_REPORT_PROGRESS (1 << 1)	/* report pgstat progress */
 
 typedef enum ReindexObjectType
 {