Nicolai Haehnle 4afb64e4c6 Revert r321751, "StructurizeCFG: Fix broken backedge detection" ...

It causes regressions in various OpenGL test suites.

Keep the test cases introduced by r321751 as XFAIL, and add a test case
for the regression.

Change-Id: I90b4cc354f68cebe5fcef1f2422dc8fe1c6d3514
Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=36015
llvm-svn: 323355

2018-01-24 18:02:05 +00:00

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