[PATCH] [ARM/Aarch64] add initial Qualcomm support

[Jim Wilson]

This adds an option for the Qualcomm server parts, qdf24xx, just
optimizing like a cortex-a57 for now, same as how the initial Samsung
exynos-m1 support worked.

This was tested with armv8 and aarch64 bootstraps and make check.

I had to disable the cortex-a57 fma steering pass in the aarch64 port
while testing the patch.  A bootstrap for aarch64 configured
--with-cpu=cortex-a57 gives multiple ICEs while building the stage1
libstdc++.  The ICEs are in scan_rtx_reg at regrename.c:1074.  This
looks vaguely similar to PR 66785.

I am also seeing extra make check failures due to ICEs with armv8
bootstrap builds configured --with-cpu=cortex-a57,  I see ICEs in
scan_rtx_reg in regrename, and ICEs in decompose_normal_address in
rtlanal.c.  The arm port doesn't have the fma steering support, which
seems odd, and is maybe a bug, so it isn't clear what is causing this
problem.

I plan to look at these aarch64 and armv8 failures next, including PR
66785.  None of these have anything to do with my patch, as they
trigger for cortex-a57 which is already supported.

Jim
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