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Mark the start of an inlined finally block.
When a finally block is inlined, any exception handlers that are
lexically inside of its try block should not cover the range of the
exception block. We scan from the innermost try block outward until
we find the try block that matches the finally block. For any block
whose exception handlers that aren't currently stopped by a finally
block, we stop the handlers at the beginning of the finally block
and set it as the finally block that has stopped the handlers. This
prevents other inlined finally blocks from prematurely ending skip
ranges and creating bad exception handler ranges.