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[lldb] Reland "Use translated full ftag values"

Authored by mgorny on Sun, Nov 15, 9:36 AM.

Description

[lldb] Reland "Use translated full ftag values"

Translate between abridged and full ftag values in order to expose
the latter in the gdb-remote protocol while the former are used by
FXSAVE/XSAVE... This matches the gdb behavior.

The Shell/Register tests now rely on the new behavior, and therefore
are run on non-Darwin systems only. The Python (API) test relies
on the legacy behavior, and is run on Darwin only.

Differential Revision: https://reviews.llvm.org/D91504

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