[IMCC] Minor cleanups of IMCC's PBC emitting code.  It's slightly shorter, some of the variables have tighter scope, and a few of the names and comments are saner.  There's still a lot of work to go; Extract Function and Rename Symbol are very nice refactorings here.
[IMCC] Minor cleanups of IMCC's PBC emitting code.  It's slightly shorter, some
of the variables have tighter scope, and a few of the names and comments are
saner.  There's still a lot of work to go; Extract Function and Rename Symbol
are very nice refactorings here.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@25734 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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