Tidy up treatment of big lambda (fixes Trac #2898)
There was a leftover big lambda in the CorePrep'd code, which confused the bytecode generator. Actually big lambdas are harmless. This patch refactors ByteCodeGen so that it systemantically used 'bcView' to eliminate junk. I did a little clean up in CorePrep too. See comments in Trac #2898.
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