vect/testsuite: Adjust dumping for fully masking decision

vect/testsuite: Adjust dumping for fully masking decision

As Richard S. suggested in the review of vector with length patch
series, we can use one message on "partial vectors" instead of
"fully with masking".  This patch is to update the dumping string
and related test cases.

Bootstrapped/regtested on aarch64-linux-gnu.

gcc/ChangeLog:

	* tree-vect-loop.c (vect_analyze_loop_2): Update dumping string
	for fully masking to be more common.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/sve/clastb_1.c: Update dumping string.
	* gcc.target/aarch64/sve/clastb_2.c: Likewise.
	* gcc.target/aarch64/sve/clastb_3.c: Likewise.
	* gcc.target/aarch64/sve/clastb_4.c: Likewise.
	* gcc.target/aarch64/sve/clastb_5.c: Likewise.
	* gcc.target/aarch64/sve/clastb_6.c: Likewise.
	* gcc.target/aarch64/sve/clastb_7.c: Likewise.