nir: Fix implicit conversion build -Werror on AOSP

Fix couple of following implicit conversion build -Werror
by type casting them explicitly:

"
src/compiler/nir/nir_opt_copy_prop_vars.c:193:16: error: implicit conversion from 'unsigned int' to 'nir_component_mask_t' (aka 'unsigned short') changes value from 4294967295 to 65535 [-Werror,-Wconstant-conversion]
               BITFIELD_MASK(glsl_get_vector_elements(payload->type));
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/util/macros.h:326:18: note: expanded from macro 'BITFIELD_MASK'
   ((b) == 32 ? (~0u) : BITFIELD_BIT((b) % 32) - 1)
                 ^~~
"

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Change-Id: I9208204b706fac23f29eee57d497d0f329f5f972
1 file changed