This change enables printing stack trace at stack overflow to the
console. In case multiple threads fail with stack overflow in parallel,
only the trace of the first thread is printed.

* Update the stack overflow stack size to use fixed size as a basis rather than
basing it on the virtual page size.
* Rename the AdjustContextForWriteBarrier to AdjustContextForJITHelpers
* Add waiting for the stack overflow stack trace printing completion to
the `EEPolicy::HandleFatalStackOverflow` so that it gets printed
completely even in case of multiple threads failing with stack overflow.