re PR c/68107 (Non-VLA type whose size is half or more of the address space constructed via a pointer)

	PR c/68107
	PR c++/68266
	* c-common.c (valid_array_size_p): New function.
	* c-common.h (valid_array_size_p): Declare.

	* c-decl.c (grokdeclarator): Call valid_array_size_p.  Remove code
	checking the size of an array.

	* decl.c (grokdeclarator): Call valid_array_size_p.  Remove code
	checking the size of an array.

	* c-c++-common/pr68107.c: New test.
	* g++.dg/init/new38.C (large_array_char): Adjust dg-error.
	(large_array_char_template): Likewise.
	* g++.dg/init/new44.C: Adjust dg-error.

From-SVN: r230174