[PATCH 2/2] MIPS: fix Irix gas testcases

[Maciej W. Rozycki]

On Mon, 5 Jun 2023, YunQiang Su wrote:

> 1. add -mpdr to some cases.
>    gas doesn't generate .pdr section for Irix objects by default. See
>    `int mips_flag_pdr` in tc-mips.c.

 Non-PDR variants of the respective dumps need to be added then, veryfying 
that PDR data is not produced where applicable.  We have prior art in the 
testsuite for such arrangements; cf. ${imips}.  This can be reused for all 
IRIX psABI targets.

> 2. disable call-nonpic-1 for Irix.
>    gas doesn't set O32 flags for Irix objects in e_flags. See
>    `use_e_mips_abi_o32` in gas/configure.ac.

 This needs to be verified then too.

> 3. mips16-e.d: g1 may be marked as O.
>    The Irix 5 and 6 assemblers set the type of any common symbol and
>    any undefined non-function symbol to STT_OBJECT.
>    See `mips_frob_symbol` in tc-mips.c.

 This is minor enough, so probably OK.  It might be worth checking if it's 
covered elsewhere.

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  Maciej