Use static inline function for BufferGetPage()

I was initially concerned that the some of the hundreds of
references to BufferGetPage() where the literal
BGP_NO_SNAPSHOT_TEST were passed might not optimize as well as a
macro, leading to some hard-to-find performance regressions in
corner cases.  Inspection of disassembled code has shown identical
code at all inspected locations, and the size difference doesn't
amount to even one byte per such call.  So make it readable.

Per gripes from Álvaro Herrera and Tom Lane

src/backend/storage/buffer/bufmgr.c

@@ -4295,7 +4295,7 @@ IssuePendingWritebacks(WritebackContext *context)
  * For best performance, keep the tests that are fastest and/or most likely to
  * exclude a page from old snapshot testing near the front.
  */
-extern Page
+extern void
 TestForOldSnapshot(Snapshot snapshot, Relation relation, Page page)
 {
 	Assert(relation != NULL);
@@ -4311,6 +4311,4 @@ TestForOldSnapshot(Snapshot snapshot, Relation relation, Page page)
 		ereport(ERROR,
 				(errcode(ERRCODE_SNAPSHOT_TOO_OLD),
 				 errmsg("snapshot too old")));
-
-	return page;
 }