* Add optimizations related to caller/callee saved registers, thread synchronization and disable tier 0
* Refactoring
* Add a config entry to enable or disable the reg load/store opt.
* Remove unnecessary register state stores for calls when the callee is know
* Rename IoType to VarType
* Enable tier 0 while fixing some perf issues related to tier 0
* Small tweak -- Compile before adding to the cache, to avoid lags
* Add required config entry
* Fix and simplify TranslatorCache
* Fix some assignment alignments, remove some unused usings
* Changes to ILEmitter, separate it from ILEmitterCtx
* Rename ILEmitter to ILMethodBuilder
* Rename LdrLit and *_Fix opcodes
* Revert TranslatorCache impl to the more performant one, fix a few issues with it
* Allow EmitOpCode to be called even after everything has been emitted
* Make Emit and AdvanceOpCode private, simplify it a bit now that it starts emiting from the entry point
* Remove unneeded temp use
* Add missing exit call on TestExclusive
* Use better hash
* Implement the == and != operators
