[Reassociate][test] Delete improper -NOT patterns to work with -enabl…

…e-new-pm=1 The two tests rely on LegacyInlinerBase::doFinalization to remove Function::isDefTriviallyDead() functions. The new PM does not have the behavior. The -NEXT patterns checking the emptiness are actually sufficient. Note, reassociate-deadinst.ll has become stale - it no longer catches the problem r285380 intended. Unfortunately it is difficult to craft a new test because it is actually pretty difficult to break it with `MadeChange = true;` all over the file.
llvm · Oct 29, 2020 · ee7e03e · ee7e03e
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diff --git a/llvm/test/Transforms/Reassociate/erase_inst_made_change.ll b/llvm/test/Transforms/Reassociate/erase_inst_made_change.ll
@@ -21,7 +21,6 @@ entry:
 }
 
 define internal void @bar() noinline nounwind readnone {
-; CHECK-NOT: bar
 entry:
   ret void
 }

diff --git a/llvm/test/Transforms/Reassociate/reassociate-deadinst.ll b/llvm/test/Transforms/Reassociate/reassociate-deadinst.ll
@@ -1,6 +1,5 @@
 ; RUN: opt < %s -inline -function-attrs -reassociate -S | FileCheck %s
 
-; CHECK-NOT: func1
 ; CHECK-LABEL: main
 ; CHECK-NEXT: ret void