[UTC] Update test check removes check lines for declarations (and leaves the argument checks)

[jdoerfert]

Since da28c33 the check lines of certain declarations are removed but the argument check-same lines are kept. That is obviously broken.

As an example, this is what happens if I update the Attributor tests now:

  --- a/llvm/test/Transforms/Attributor/misc_crash.ll
  +++ b/llvm/test/Transforms/Attributor/misc_crash.ll
  @@ -124,7 +124,6 @@ define internal i16 @bar3(ptr %p1, i16 %p2) {
     ret i16 %p2
   }

  -; CHECK-LABEL: declare {{[^@]+}}@func6
   ; CHECK-SAME: (ptr)
   declare void @func6(ptr)
   ;.
~

[jdoerfert]

@hnrklssn ping.

[hnrklssn]

Taking a look now

[jdoerfert]

Still somewhat broken. As far as I can tell we now do different and inconsistent things when we encounter

 ; CHECK: Function Attrs: norecurse willreturn
 ; CHECK-NEXT: declare void @will_return()
 declare void @will_return() willreturn norecurse

vs

 declare void @will_return() willreturn norecurse

The latter is just left alone.
For the former we drop the CHECK-NEXT line and keep the CHECK line (also in continues updates).