perf symbols: work around incorrect ET_EXEC symbol adjustment

Workaround to adjust .text symbols from ET_EXEC images correctly.

This is not a complete fix, but addresses the common case and does not
create additional assumptions beyond those which perf already makes.
ELF images with a weird link map may still be processed incorrectly
(as at present) -- that will require a separate fix.

The workaround allows correct symbol offsets to be generated for
ET_EXEC executables on systems with separated debug info (where
section sh_offset fields from the debug image may bear no relation to
the layout of the executable image).

The cover note accompanying this patch contains a more detailed
explanation.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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