use --match-full-lines in start stop test

Author: paperchalice

llvm/test/tools/llc/new-pm/start-stop.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mtriple=x86_64-pc-linux-gnu -enable-new-pm -print-pipeline-passes -start-before=mergeicmps -stop-after=gc-lowering -filetype=null %s | FileCheck %s
+; RUN: llc -mtriple=x86_64-pc-linux-gnu -enable-new-pm -print-pipeline-passes -start-before=mergeicmps -stop-after=gc-lowering -filetype=null %s | FileCheck --match-full-lines %s
 
-; CHECK: function(mergeicmps,expand-memcmp,gc-lowering)
+; CHECK: IR pipeline: function(mergeicmps,expand-memcmp,gc-lowering)