Avoid -Wvla-parameter for nontrivial bounds [PR97548].

Avoid -Wvla-parameter for nontrivial bounds [PR97548].

Resolves:
PR c/101289 - bogus -Wvla-paramater warning when using const for vla param
PR c/97548 -  bogus -Wvla-parameter on a bound expression involving a parameter

gcc/c-family/ChangeLog:

	PR c/101289
	PR c/97548
	* c-warn.c (warn_parm_array_mismatch): Use OEP_DECL_NAME.

gcc/c/ChangeLog:

	PR c/101289
	PR c/97548
	* c-decl.c (get_parm_array_spec): Strip nops.

gcc/ChangeLog:

	PR c/101289
	PR c/97548
	* fold-const.c (operand_compare::operand_equal_p): Handle OEP_DECL_NAME.
	(operand_compare::verify_hash_value): Same.
	* tree-core.h (OEP_DECL_NAME): New.

gcc/testsuite/ChangeLog:

	* gcc.dg/Wvla-parameter-12.c: New test.