riscv: selftests: Add signal handling vector tests

Add two tests to check vector save/restore when a signal is received
during a vector routine. One test ensures that a value is not clobbered
during

riscv: selftests: Add signal handling vector tests

Add two tests to check vector save/restore when a signal is received
during a vector routine. One test ensures that a value is not clobbered
during signal handling. The other verifies that vector registers
modified in the signal handler are properly reflected when the signal
handling is complete.

Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Björn Töpel <[email protected]>
Reviewed-by: Andy Chiu <[email protected]>
Tested-by: Andy Chiu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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