Rollup merge of #151736 - Zalathar:can-load-from-disk, r=nnethercote Make some load-from-disk function pointers optional in query vtables For queries that never incremental-cache to disk, we can represent that fact with None (i.e. a null function pointer) in their vtables, and avoid having to generate stub functions that do nothing. (There is no decrease in vtable size; we just go from 3/8 padding bytes to 4/8 padding bytes.) There should be no change to compiler output.
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