[gcov,test] Update exit-block.ll now that exit block is always the second

Follow-up to 82fecab

Author: MaskRay

llvm/test/Transforms/GCOVProfiling/exit-block.ll

@@ -3,13 +3,9 @@
 ; RUN: echo '!19 = !{!"%/t/exit-block.ll", !0}' > %t/1
 ; RUN: cat %s %t/1 > %t/2
 
-; By default, the exit block is the second.
+; The exit block is the second.
 ; RUN: opt -passes=insert-gcov-profiling -disable-output %t/2
-; RUN: llvm-cov gcov -n -dump %t/exit-block.gcno 2>&1 | FileCheck --check-prefixes=CHECK,EXIT-SECOND %s
-
-; But we can optionally emit it last, to match GCC<4.8 (r189778).
-; RUN: opt -passes=insert-gcov-profiling -default-gcov-version='407*' -disable-output %t/2
-; RUN: llvm-cov gcov -n -dump %t/exit-block.gcno 2>&1 | FileCheck --check-prefixes=CHECK,EXIT-SECOND %s
+; RUN: llvm-cov gcov -n -dump %t/exit-block.gcno 2>&1 | FileCheck %s
 
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
@@ -66,10 +62,7 @@ attributes #2 = { nounwind }
 
 ; There should be no destination edges for the exit block.
 ; CHECK: Block : 1 Counter : 0
-; EXIT-LAST:       Destination Edges
-; EXIT-SECOND-NOT: Destination Edges
 ; CHECK: Block : 2 Counter : 0
 ; CHECK: Block : 4 Counter : 0
-; EXIT-LAST-NOT: Destination Edges
-; EXIT-SECOND:   Destination Edges
+; CHECK:         Destination Edges
 ; CHECK-NOT: Block :