[coroutines] Add missing pass dependency.

[ben-clayton]

Summary

CoroSplit depends on CallGraphWrapperPass, but it was not explicitly adding it as a pass dependency.

This missing dependency can trigger errors / assertions / crashes in PMTopLevelManager::schedulePass() under certain configurations.

[GorNishanov]

LGTM! Thank you for fixing it.

[ben-clayton]

Thank you for the approval Gor.
I still do not have permissions to submit changes. If you would be so kind :)

Cheers,
Ben

llvm/trunk/lib/Transforms/Coroutines/CoroSplit.cpp

struct CoroSplit : public CallGraphSCCPass {
 
   StringRef getPassName() const override { return "Coroutine Splitting"; }
 };
 
 } // end anonymous namespace
 
 char CoroSplit::ID = 0;
 
-INITIALIZE_PASS(
+INITIALIZE_PASS_BEGIN(
+    CoroSplit, "coro-split",
+    "Split coroutine into a set of functions driving its state machine", false,
+    false)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_END(
     CoroSplit, "coro-split",
     "Split coroutine into a set of functions driving its state machine", false,
     false)
 
 Pass *llvm::createCoroSplitPass() { return new CoroSplit(); }