HashProgramOutput: Use compute md5 command.

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@111459 91177308-0d34-0410-b5e6-96231b3b80d8

Author: ddunbar

HashProgramOutput.sh

@@ -15,5 +15,5 @@ if [ ! -x "$md5cmd" ]; then
 fi
 
 mv $1 $1.bak
-md5 < $1.bak > $1
+$md5cmd < $1.bak > $1
 rm -f $1.bak