Make coff-dump.py executable and add python as executable for this script.

This fixes the MC/COFF/basic-coff.ll test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109497 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Scripts/coff-dump.py b/test/Scripts/coff-dump.py
old mode 100644
new mode 100755
index b3e16e5..57a5813
--- a/test/Scripts/coff-dump.py
+++ b/test/Scripts/coff-dump.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 #===-- coff-dump.py - COFF object file dump utility-------------------------===#
 #
 #                     The LLVM Compiler Infrastructure