[Coroutines, test] Fix use of var defined in CHECK-NOT

[thopre]

Summary

LLVM test Transforms/Coroutine/coro-split-sink-lifetime-O2.ll tries to
check for the absence of a sequence of instructions with several
CHECK-NOT with one of those directives using a variable defined in
another. However CHECK-NOT are checked independently so that is using a
variable defined in a pattern that should not occur in the input.

This commit simplifies the CHECK-NOT block to only check for the
presence of any lifetime start marker since that is effectively what
the test was testing at the moment.

[junparser]

LGTM

llvm/test/Transforms/Coroutines/coro-split-sink-lifetime-02.ll

 
 exit:
   call i1 @llvm.coro.end(i8* null, i1 false)
   ret void
 }
 
 ; CHECK-LABEL: @a.resume(
 ; CHECK:    %[[VAL:testval.+]] = getelementptr inbounds %a.Frame
-; CHECK-NOT:     %testval = alloca i32, align 4
-; CHECK-NOT:     %[[CAST:.+]] = bitcast i32* %testval to i8*
-; CHECK-NOT:     call void @llvm.lifetime.start.p0i8(i64 4, i8* %[[CAST]])
+; CHECK-NOT:     call void @llvm.lifetime.start.p0i8(i64 4, i8* %{{.*}})
 ; CHECK:         %test = load i32, i32* %[[VAL]]
 ; CHECK-NOT:     %test = load i32, i32* %testval
 
 declare token @llvm.coro.id(i32, i8* readnone, i8* nocapture readonly, i8*)
 declare i1 @llvm.coro.alloc(token) #3
 declare noalias nonnull i8* @"\01??2@YAPEAX_K@Z"(i64) local_unnamed_addr
 declare i64 @llvm.coro.size.i64() #5
 declare i8* @llvm.coro.begin(token, i8* writeonly) #3