[FIX] Delete incorrect CHECK in test Transforms/FunctionAttrs/noreturn.ll

[• lisitsynSA]

Summary

I made backport of "Fix a bug in mayHaveSideEffects. Functions that do not return are now considered as instructions with side effects." (http://llvm.org/viewvc/llvm-project?view=revision&revision=175553) to llvm 3.1 and found that test from this fix contained incorrect "CHECK: ret". The “ret” doesn’t appear after all optimizations and CHECK doesn't find ret but finds the word "noreturn" in attributes, so FileCheck passes.

; Function Attrs: noreturn nounwind ssp uwtable
define i32 @main() #1 {
entry:
  tail call void @endless_loop()
  unreachable
}

attributes #0 = { noreturn nounwind readnone ssp uwtable }
attributes #1 = { noreturn nounwind ssp uwtable }

The llvm 3.1 doesn't make attributes, so I found this inaccuracy.

test/Transforms/FunctionAttrs/noreturn.ll

 ; RUN: opt < %s -functionattrs -instcombine -S | FileCheck %s
 
 define void @endless_loop() noreturn nounwind readnone ssp uwtable {
 entry:
   br label %while.body
 
 while.body:
   br label %while.body
 }
 ;CHECK-LABEL: @main(
 ;CHECK: endless_loop
-;CHECK: ret
 define i32 @main() noreturn nounwind ssp uwtable {
 entry:
   tail call void @endless_loop()
   unreachable
 }