tree-optimization/96974 - avoid ICE by replacing assert with standard failure

Minor patch to add a graceful exit in the rare case where an invalid
combination of TYPE_VECTOR_SUBPARTS for nunits_vectype and
*stmt_vectype_out is reached in vect_get_vector_types_for_stmt.

This resolves the ICE seen in PR tree-optimization/96974, however the issue
of correctly handling this rare vectorization combination is left for a
later patch.

Bootstrapped and reg-tested on aarch64-linux-gnu.

2021-03-25  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

gcc/ChangeLog:

	PR tree-optimization/96974
	* tree-vect-stmts.c (vect_get_vector_types_for_stmt): Replace assert
	with graceful exit.

gcc/testsuite/ChangeLog:

	PR tree-optimization/96974
	* g++.target/aarch64/sve/pr96974.C: New test.

0 files changed, 0 insertions, 0 deletions