The first patch supported only LMUL=1 types. This patch supports
LMUL!=1.
LMUL is length multiplier that allows multiple vector registers to
be treated as one large register or a fraction of a single vector
register. Supported values for LMUL are 1/8, 1/4, 1/2, 1, 2, 4, and 8.
An LMUL=2 type will be twice as large as an LMUL=1 type. An LMUL=1/2
type will be half the size as an LMUL=1 type.
Type name with "m2" is LMUL=2, "m4" is LMUL=4.
Type name with "mf2" is LMUL=1/2, "mf4" is LMUL=1/4.
For the LMUL!=1 types the user will need to scale __riscv_v_fixed_vlen
by the LMUL before passing to the attribute.
LMULo -> LMUL