[llvm-commits] [patch][pr11202] Handle BB with address taken being deleted from codegen

[Rafael Espíndola]

Both Eli and Joshua pointed out that having to manually call
UpdateForDeletedMachineBlock was error prone.

Eli suggested keeping track of which symbols are used and print the
missing ones at the end. This patch implements this. One nice property
is that it works both for IL and machine code. One problem is that the
labels are printed at the end of the file, not at the start of the
function they would be in. Not sure if that is real problem.

The handling of RAUW still depends on the callback, but fortunately I
don't think we RAUW machine basic blocks.

Cheers,
Rafael
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