RISC-V Regression test: Fix FAIL of pr45752.c for RVV

RVV use load_lanes with stride = 5 vectorize this case with -fno-vect-cost-model
instead of SLP.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/pr45752.c: Adapt dump check for target supports load_lanes with stride = 5.