tree-ssa-pre.c/115214(ICE in find_or_generate_expression, at tree-ssa-pre.c:2780...

tree-ssa-pre.c/115214(ICE in find_or_generate_expression, at tree-ssa-pre.c:2780): Return NULL_TREE when deal special cases.

Return NULL_TREE when genop3 equal EXACT_DIV_EXPR.
https://gcc.gnu.org/pipermail/gcc-patches/2024-May/652641.html

version log v3: remove additional POLY_INT_CST check.
https://gcc.gnu.org/pipermail/gcc-patches/2024-May/652795.html

gcc/ChangeLog:

	* tree-ssa-pre.cc (create_component_ref_by_pieces_1): New conditions.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/pr115214.c: New test.