[Committed] PR middle-end/102029: Stricter typing in LSHIFT_EXPR sign folding.

[Committed] PR middle-end/102029: Stricter typing in LSHIFT_EXPR sign folding.

My sincere apologies to everyone (again).  As diagnosed by
Jakub Jelinek, my recent patch to fold the signedness of LSHIFT_EXPR
needs to be careful not to attempt transforming a left shift in an
integer type into an invalid left shift of a pointer type.

2021-08-24  Roger Sayle  <roger@nextmovesoftware.com>
	    Jakub Jelinek  <jakub@redhat.com>

gcc/ChangeLog
	PR middle-end/102029
	* match.pd (shift transformations): Add an additional check for
	!POINTER_TYPE_P in the recently added left shift transformation.

gcc/testsuite/ChangeLog
	PR middle-end/102029
	* gcc.dg/fold-convlshift-3.c: New test case.