[llvm-readelf/obj] - Stop calling reportError in printArchSpecificInfo().
This is related to MIPS. Currently we might report an error and exit,
though there is no problem to report a warning and try to continue dumping
an object. The code uses MipsGOTParser<ELFT> Parser, which is isolated
in this method.
Differential revision: https://reviews.llvm.org/D92090