Fix bug in LLVM Global To Wide

[trivial and not reviewed]

Was using a reference to something that could change
in other function call... just moved reference variable
creation down a line.



git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@21850 3a8e244f-b0f2-452b-bcba-4c88e055c3ca