Eliminate uses of %prcontext.

- I'd appreciate it if someone else eyeballs my changes to make sure I captured
   the intent of the test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81083 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/IndVarSimplify/2003-09-23-NotAtTop.ll

@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | opt -indvars | llvm-dis | %prcontext ^Loop: 1 | grep %Canonical
+; RUN: opt -S -indvars %s | FileCheck %s
 
 ; The indvar simplification code should ensure that the first PHI in the block 
 ; is the canonical one!
@@ -8,6 +8,8 @@ define i32 @test() {
         br label %Loop
 
 Loop:           ; preds = %Loop, %0
+; CHECK: Loop:
+; CHECK-NEXT: Canonical
         %NonIndvar = phi i32 [ 200, %0 ], [ %NonIndvarNext, %Loop ]             ; <i32> [#uses=1]
         %Canonical = phi i32 [ 0, %0 ], [ %CanonicalNext, %Loop ]               ; <i32> [#uses=2]
         store i32 %Canonical, i32* null