[perf] Add FIXME about exceptions in getDynamicInstructionInfo.
[perf] Add FIXME about exceptions in getDynamicInstructionInfo.

mit-carbon/Graphite,nkawahara/Graphite,victorisildur/Graphite,fhijaz/Graphite,fhijaz/Graphite,victorisildur/Graphite,mit-carbon/Graphite,mit-carbon/Graphite-Cycle-Level,victorisildur/Graphite,nkawahara/Graphite,fhijaz/Graphite,8l/Graphite,victorisildur/Graphite,mit-carbon/Graphite,8l/Graphite,nkawahara/Graphite,mit-carbon/Graphite-Cycle-Level,mit-carbon/Graphite,mit-carbon/Graphite-Cycle-Level,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,8l/Graphite,nkawahara/Graphite,8l/Graphite