JIT: Runtime async enhancements

[jakobbotsch]

Meta issue for the runtime-async tracked enhancements

• JIT: Compute async liveness for address exposed locals #124001
• JIT: Enable inlining of runtime async methods without awaits #124183
• JIT: Add a "default value analysis" for async hoisting #124514
• JIT: Create suspensions/resumptions separately from processing calls in async transformation #125497
• Add runtime async support for saving and reusing continuation instances #125556
• JIT: Add a runtime async optimization to skip saving unmutated locals into reused continuations #125615
• Combine default-value analysis and preserved-value analysis IR traversals
• Factor analyses into a separate file
• Stop running analyses in debug codegen (but keep doing it for tier0)
• JIT: We can improve async value analysis for implicit byrefs #125949
• Rename AsyncLiveness
• JIT: Optimize and share context-handling at tail of suspensions #125691
• JIT: Continuation allocation code can be shared #125688
• JIT: Avoid unnecessary extra sections for crossgen producing PE outside Windows #125268
• Investigate generating resumption stubs as funclet-like code in runtime async functions #121013
• Optimize runtime async OSR resumption performance #120865
• Runtime async should avoid boxing custom awaiters on suspension #119842
• [runtime-async] Optimize synchronous Task-returning wrappers used in async context #115771
• JIT: Opportunities to optimize away ExecutionContext/SynchronizationContext saves/restores #117308
• Further runtime async enhancements for suspension-heavy async code #127273
• JIT: Tracking issue for general runtime async inlining #127865

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[jakobbotsch]

Will reopen a new issue for .NET 12.