Commits on Sep 13, 2021

1. Handle failure in ffi_closure_alloc …

   `ffi_closure_alloc` may fail and return `NULL` if, for instance, we're
   running in a locked-down operating system that forbids FFI from
   allocating executable pages of memory in any of the ways that it tries.
   Today we pass this `NULL` on to `ffi_prep_closure_loc` which triggers a
   segmentation fault that takes down the whole JVM. With this change we
   check for a failure in this call and turn it into an
   `UnsupportedOperationException` so that the caller can handle it more
   gracefully.
   
   Relates elastic/elasticsearch#73309
   Relates elastic/elasticsearch#18272

   

   DaveCTurner committed Sep 13, 2021
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