From: Raphael Gault <redacted>

This plugins comes into play before the final 2 RTL passes of GCC and
detects switch-tables that are to be outputed in the ELF and writes
information in an ".discard.switch_table_info" section which will be
used by objtool.

Signed-off-by: Raphael Gault <redacted>
[J.T.: Change section name to store switch table information,
       Make plugin Kconfig be selected rather than opt-in by user,
       Add a relocation in the switch_table_info that points to
       the jump operation itself]
Signed-off-by: Julien Thierry <redacted>

Rather than tightly couple this feature to a particular toolchain via
plugin, it might be nice to consider what features could be spec'ed out
for toolchains to implement (perhaps via a -f flag).

Distributions (like Android, CrOS) wont be able to use such a feature as
is.

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