[PATCH 1/2][AArch64 Testsuite] Add execution test of vset(q?)_lane intrinsics.

[Alan Lawrence]

This adds a test thath checks the result of a vset_lane intrinsic is identical 
to the input apart from one value being changed.

Test checks only one index per vset_lane_xxx in a somewhat adhoc fashion as the 
index has to be a compile-time immediate and I felt that doing a loop using 
macros did not add enough to justify the complexity.

Passing on aarch64-none-elf and aarch64_be-none-elf (cross-tested).

gcc/testsuite/ChangeLog:

	gcc.target/aarch64/vset_lane_1.c: New test.
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