Tiered compilation fails to elide value type null check #1713
Description
AsyncMethodBuilderCore is implemented with the assumption that value type state machines will not be boxed for a runtime comparison with null:
This assumption does not hold for Tier 0 compilation. For a release build of Roslyn, execution of analyzers on Roslyn.sln produces 20% (70GB) of its total allocations boxing state machines for this null check.