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The instrumentation code outputs offsets relative to the start of text
as defined by a special symbol (linker_script_start_of_text). This
currently corresponds to the first symbol appearing in text, which
also happens to be the first SymbolInfo produced by
symbol_extractor. To protect against changes to the symbol_extractor
this change uses the special symbol for the dump offset base rather
than the lowest SymbolInfo offset seen.

Bug: 893981
Change-Id: Ia3d265ae56e6a3b7362abf177c9cbe8d2eda36fb
Reviewed-on: https://chromium-review.googlesource.com/c/1325989Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606454}