This patch teaches BasicBlock::print to construct an instance of
SlotTracker with the containing function.
Without this patch, we dump:
*** IR Dump After LoopInstSimplifyPass ***
; Preheader:
br label %1
; Loop:
<badref>: ; preds = %1, %0
br label %1
Note "<badref>" above. This happens because BasicBlock::print calls:
SlotTracker SlotTable(this->getModule());
Note that this constructor does not add the contents of functions to
the slot table. That is, basic blocks are left unnumbered.
This patch fixes the problem by switching to:
SlotTracker SlotTable(this->getParent());
which does add the contents of the Module and the function,
this->getParent(), to the slot table.
Differential Revision: https://reviews.llvm.org/D89567
Kazu Hirata