not actually an xfail, just intended behavior for this test to crash when run with an explicit passes pipeline

Per 4189584

Author: vtjnash

llvm/test/Transforms/InstCombine/fixedpoint-and-or-icmps.ll

@@ -1,6 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -passes=instcombine -S | FileCheck %s
-; XFAIL: *
+; RUN: opt < %s -passes='instcombine<max-iterations=5>' -S | FileCheck %s
 
 ; This is a fuzzer-generated test that would assert because
 ; we'd get into foldAndOfICmps() without running InstSimplify