YJIT: Fix staying in invalidated code after proc calls #6711
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Previously, there is no instruction boundary patch point after the call to a non-leaf C function we generate for
OPTIMIZED_METHOD_TYPE_CALL. This meant that if code GC is triggered while inside the C function, we would keep running invalidated code when we return from the C function. This had the effect of running stale branch stubs, jumping to bad code, etc.
Use jit_prepare_routine_call() to make sure we exit from the invalidated region as soon as possible after the C call in case of invalidation.