Merge r326404 into the 6.0 branch : [IPSCCP] do not break musttail invariant (#36485 )

[llvmbot]

Bugzilla Link	36604
Resolution	FIXED
Resolved on	Apr 11, 2018 15:40
Version	6.0
OS	All
Blocks	#35997
Reporter	LLVM Bugzilla Contributor
CC	@fhahn,@tstellar
Fixed by commit(s)	r326404 r329855

Extended Description

Is it OK to merge the following revision(s) to the 6.0 branch?

[llvmbot]

https://reviews.llvm.org/rL326404

[tstellar]

Hi Eli,

Is this OK to merge to the release_60 branch?

[efriedma-quic]

Yes, should be fine to merge.

[tstellar]

Fedor can you merge this or paste a working patch to this email. When I merge this to release_60 and fix a small compile error, the Transforms/IPConstantProp/musttail-call.ll test case fails for me.

[llvmbot]

Suggested patch
Here's a suggested patch. Apparently, the optimizer doesn't remove the calls themselves in 6.0, so the original test can be ported only partially. Please let me know if you agree with my assessment of it.

Thanks!

[tstellar]

Merged: r329855

[zmodem]

mentioned in issue #35997