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/executor/nodeAgg.h

@@ -281,10 +281,13 @@ typedef struct AggStatePerPhaseData
 
 	ExprState  *evaltrans;		/* evaluation of transition functions  */
 
-	/* cached variants of the compiled expression */
-	ExprState  *evaltrans_cache
-				[2]		/* 0: outerops; 1: TTSOpsMinimalTuple */
-				[2];	/* 0: no NULL check; 1: with NULL check */
+	/*----------
+	 * Cached variants of the compiled expression.
+	 * first subscript: 0: outerops; 1: TTSOpsMinimalTuple
+	 * second subscript: 0: no NULL check; 1: with NULL check
+	 *----------
+	 */
+	ExprState  *evaltrans_cache[2][2];
 }			AggStatePerPhaseData;
 
 /*