middle-end: use MAX_FIXED_MODE_SIZE instead of precidion of TImode/DImode

middle-end: use MAX_FIXED_MODE_SIZE instead of precidion of TImode/DImode

On Tue, Sep 19, 2023 at 05:50:59PM +0100, Richard Sandiford wrote:
> How about using MAX_FIXED_MODE_SIZE for things like this?

Seems like a good idea.

The following patch does that.

2023-09-20  Jakub Jelinek  <jakub@redhat.com>

	* match.pd ((x << c) >> c): Use MAX_FIXED_MODE_SIZE instead of
	GET_MODE_PRECISION of TImode or DImode depending on whether
	TImode is supported scalar mode.
	* gimple-lower-bitint.cc (bitint_precision_kind): Likewise.
	* expr.cc (expand_expr_real_1): Likewise.
	* tree-ssa-sccvn.cc (eliminate_dom_walker::eliminate_stmt): Likewise.
	* ubsan.cc (ubsan_encode_value, ubsan_type_descriptor): Likewise.