Not all sparc hwcaps bits do have a defined meaning. For those that
don't we use the "resvBIT" string, where BIT is 0..31. Bits 29 to 31
weren't defined, but we forgot to add the "resv29" string causing an
off-by one when trying to find the name for bit 30 (called "resv31")
and 31 (not set, so NULL).
* backends/sparc_attrs.c (sparc_check_object_attribute):
insert "resv29" into hwcaps array.