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Add a description to the test from r211433 explaining why it's written that way.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211465 91177308-0d34-0410-b5e6-96231b3b80d8
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; RUN: opt -S -loop-unswitch -instcombine -indvars < %s | FileCheck %s
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; This used to crash in SCEVExpander when there were congruent phis with and
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; undef incoming value from the loop header. The -loop-unswitch -instcombine is
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; necessary to create just this pattern, which is essentially a nop and gets
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; folded away aggressively if spelled out in IR directly.
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; PR 20093
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@c = external global i32**, align 8
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define void @test1() {
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