Initial pgindent and pgperltidy run for v13.

Includes some manual cleanup of places that pgindent messed up,
most of which weren't per project style anyway.

Notably, it seems some people didn't absorb the style rules of
commit c9d297751, because there were a bunch of new occurrences
of function calls with a newline just after the left paren, all
with faulty expectations about how the rest of the call would get
indented.

src/include/storage/shmem.h

@@ -60,7 +60,7 @@ typedef struct
 	char		key[SHMEM_INDEX_KEYSIZE];	/* string name */
 	void	   *location;		/* location in shared mem */
 	Size		size;			/* # bytes requested for the structure */
-	Size		allocated_size;	/* # bytes actually allocated */
+	Size		allocated_size; /* # bytes actually allocated */
 } ShmemIndexEnt;
 
 /*