iss: Optimize TB chaining and exiting#1027
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- The decision whether to continue, chain or end the translation block is now sometimes deferred to TCG translation time
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Sometimes translation blocks must be ended (e.g. after jumps or tb-state changes). In some cases we can chain translation blocks (when the next tb-state and pc are always the same in the next block). The decision when to do that may depend on facts that are only known at translation time (e.g. instruction operands).
This PR defers the decision to translation time in certain cases.
Tests are included, but benchmarks need to be added to test for possible performance regressions.
Closes #865