Fix optimistic_yield to not yield on each call after x µs#6804

Merged

earlephilhower merged 9 commits intoesp8266:masterfrom

dok-net:optimistic_yield_recurrency

Feb 20, 2020

Commits on Feb 5, 2020

Fix optimistic_yield to not yield on every call after a loop runs for x us, but yield only every x us between optimistic_yield calls.
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Substitute micros() by CPU cycles - faster, but large values for interval_us can overflow - 26s at 160MHz CPU clock.
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Move yield start time set to esp_yield_within_cont
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Allow constexpr evalution to occur. optimistic_yield is always called with a literal parameter value.
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Due to 3rd party use of symbol optimistic_yield without #include <Arduino>, have to resort to preprocessor definition for inlining.
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Remove long-since disused define.
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No need for preprocessor undefinition of optimistic_yield, after all.
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Commits on Feb 20, 2020