Preparations for exception handling support #1575
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In preparation for unwinding support.
Once UnwindContext sets the personality function it will need to define a DW.ref.rust_eh_personality function which would cause a duplicate definition if UnwindContext is called a second time.
This is necessary to handle LSDA references in the future once unwinding is supported.
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Most of the work for adding exception handling support is blocked on the next Cranelift release. These parts can land already however.
Part of #1567