tejohnson added a comment.

In D138081#3931419 <https://reviews.llvm.org/D138081#3931419>, 
@alexander-shaposhnikov wrote:
> @tejohnson - the legacy pass manager depends on the interface defined in 
> IRPrintingPasses.h 
> (https://github.com/llvm/llvm-project/blob/main/llvm/lib/IR/LegacyPassManager.cpp#L266)
> so without splitting this would face the same issue - circular dependency 
> between LLVMCore (LegacyPassManager.cpp is in LLVMCore) and IRPrinter.

Ah, that's unfortunate. I guess we will have to live with the file duplication 
for a little while then.



================
Comment at: llvm/include/llvm/IRPrinter/IRPrintingPasses.h:33
+///
+/// Note: This pass is for use with the new pass manager. Use the create...Pass
+/// functions above to create passes for use with the legacy pass manager.
----------------
aeubanks wrote:
> tejohnson wrote:
> > aeubanks wrote:
> > > obsolete (and ditto below)
> > @aeubanks is the legacy pass manager support needed at all anymore? I'm not 
> > sure of the status there.
> we still need legacy PM passes in the codegen pipeline, which for sure 
> includes the IR printer passes
Ok that's what I though. So I guess what is obsolete is needing a comment about 
it being for the new PM.


================
Comment at: llvm/lib/IR/IRPrintingPasses.cpp:9
 //
 // PrintModulePass and PrintFunctionPass implementations.
 //
----------------
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