[PATCH][AArch64][wwwdocs] Summarise some more AArch64 changes for GCC6

[Kyrill Tkachov]

Hi all,

Here's a proposed summary of the changes in the AArch64 backend for GCC 6.
If there's anything I've missed it's purely my oversight, feel free to add
entries or suggest improvements.

Jim, you added support for the qdf24xx identifier to -mcpu and -mtune.
Could you please suggest an appropriate entry to describe it?
I think the same format as the Cortex-A35 entry in this patch would be appropriate.

Ok to commit?

Thanks,
Kyrill
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