[test][NFC] Guard one test case against LLVM checkouts at interesting paths

[xen0n]

Summary

Previously only the "store" string was being checked for not appearing
twice, but unfortunately the check also looked at the ModuleID and
source_filename lines, so the test case would fail if the LLVM
checkout's absolute path contained the substring "store".

Fix this spurious test failure by tweaking the invocation so the full
path no longer shows up in the output.

[xen0n]

Take a different approach where the desired assertion lines are not touched.

[xen0n]

rebase

[lebedev.ri]

llvm/test/Transforms/GVNHoist/non-trivial-phi.ll

1

Just change this

[xen0n]

Favor touching nothing besides the lit directive as suggested by @lebedev.ri.

[xen0n]

llvm/test/Transforms/GVNHoist/non-trivial-phi.ll

1

This is even less intrusive, thanks! I've updated the diff.

llvm/test/Transforms/GVNHoist/non-trivial-phi.ll

-; RUN: opt -passes=gvn-hoist %s -S -o - | FileCheck %s
+; RUN: opt -passes=gvn-hoist -S < %s | FileCheck %s
 
 ; CHECK: store
 ; CHECK-NOT: store
 
 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
 
 define void @f(i8* %p) {
 entry: