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Ion can do aggressive inlining, but inlining a lot of code has a negative
effect on compilation time and memory usage. It also means we spend more time
in the slower Baseline code while compiling the Ion code off-thread or after an
invalidation.
To address this, Ion now consists of two tiers:
* Normal: the first tier (warm-up threshold of 1,000) only inlines small
functions one level deep. This tier also has recompile checks to
recompile the script when it becomes very hot.
* Full: the second tier (warm-up threshold of 100,000) is only used for very
hot code so we can afford inlining a lot more code.
This improves Speedometer and GDocs by more than 5%.
Differential Revision: https://phabricator.services.mozilla.com/D24159
--HG--
extra : moz-landing-system : lando
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