[commit] Adding support for Xtensa GNU/Linux

[Maxim Grigoriev]

This patch adds support for Xtensa GNU/Linux.

We like XML approach to describe register files. It matches
Xtensa, which requires register files to be easily configurable.

But, we need more time to update Xtensa FSF GDB/GDBSERVER
to start fully using this feature. So this version of Xtensa
FSF GDB/GDBSERVER does not use this new approach.

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