riscv: selftests: Fix vsetivli args for clang

Clang does not support implicit LMUL in the vset* instruction sequences.
Introduce an explicit LMUL in the vsetivli instruction.

Signed-off-by: Charlie Jenkins <[e-mail]>
Fixes: 9d5328eeb185 ("riscv: selftests: Add signal handling vector tests")
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Palmer Dabbelt <[e-mail]>

tools/testing/selftests/riscv/sigreturn/sigreturn.c

···
 
 	asm(".option push				\n\
 		.option		arch, +v		\n\
-		vsetivli	x0, 1, e32, ta, ma	\n\
+		vsetivli	x0, 1, e32, m1, ta, ma	\n\
 		vmv.s.x		v0, %1			\n\
 		# Generate SIGSEGV			\n\
 		lw		a0, 0(x0)		\n\