[Committed] Tidy up !POINTER_TYPE_P test in match.pd LSHIFT_EXPR folding

[Committed] Tidy up !POINTER_TYPE_P test in match.pd LSHIFT_EXPR folding

As suggested by Richard Biener in the comments of PR middle-end/102029,
the new test "INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type) ..." is
redundant, and just "INTEGRAL_TYPE_P (type)" is the preferred form.

2021-08-26  Roger Sayle  <roger@nextmovesoftware.com>
	    Richard Biener  <rguenther@suse.de>

gcc/ChangeLog
	* match.pd (shift transformations): Remove a redundant
	!POINTER_TYPE_P check.