[analyzer] Finally make c++-analyzer 'executable' again.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180905 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/scan-build/c++-analyzer b/tools/scan-build/c++-analyzer
old mode 100644
new mode 100755