EnC: Defer lambda rude edit reporting to runtime

[tmat]

Defer the decision of whether or not to allow certain kinds of EnC changes to take effect to the runtime. Apply this approach to lambdas. The IDE currently blocks any changes to lambdas that would alter the shape of the closure (e.g. static lambda changed to a lambda capturing a variable). If, however, the old lambda is not invoked by the application (i.e. the delegate pointing to it is not used after the EnC update) there is no need to block the change. The new lambda will be constructed with the updated closure and can be executed without issues. The IDE does not know for any specific lambda whether or not the application will use the delegate after the edit. However, if we update the old version of the lambda body to throw an exception with rude edit message we can allow the change to go through. If the old lambda is executed it will throw and the debugger will display the rude edit message. As a follow up we will also consider emitting a specific exception type that gets a special treatment from the debugger -- see https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1903644.

Fixes #67841, #68708
Implements #70450, #54672

[tmat]

@davidwengier @cston @jjonescz PTAL

[davidwengier]

EnC specific stuff looks good to me.

[cston]

                    // A new display class and method is generated for lambda that captures x.

Are we capturing x in the second generation?

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Refers to: src/Compilers/CSharp/Test/Emit/Emit/EditAndContinue/EditAndContinueClosureTests.cs:6602 in 187755b. [](commit_id = 187755b, deletion_comment = False)

[cston]

    public void CapureOrdering()

Typo

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Refers to: src/Compilers/CSharp/Test/Emit/Emit/EditAndContinue/EditAndContinueClosureTests.cs:8872 in 187755b. [](commit_id = 187755b, deletion_comment = False)

[cston]

Reviewed Compiler and EE changes; minor comments only.

[tmat]

Had to force push :( Changes are in the last commit.