Add comments to narrowWideReferences.cpp (no behavioral changes) [reviewed by gbt]
Add comments to narrowWideReferences.cpp (no behavioral changes) [reviewed by gbt]

There is one structural change on line 97 (revised): I broke the if ... else if
into two independent ifs, to provide more room for comments.  The two cases are
mutually exclusive, so neither dominates.  My change makes the structure more
symmetrical.

[smoke-tested with hello.chpl (no-local)]




git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@22327 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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