Bug 47790 - [4.5/4.6/4.7 Regression] optimize_bitfield_assignment_op no longer works in 4.5.x

[Jeff Law]

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Andrew included a patch in this PR to make
optimize_bitfield_assignment_op work again.  I've fixed a couple
indention problems and added a couple comments.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.  Applied
to trunk.

Interestingly enough, it clearly helps the testcase referenced in the
PR, but doesn't help GCC itself or the runtime libraries.
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