[CodeGenPrepare] Move CodeGenPrepare into lib/CodeGen.
CodeGenPrepare uses extensively TargetLowering which is part of libLLVMCodeGen. This is a layer violation which would introduce eventually a dependence on CodeGen in ScalarOpts. Move CodeGenPrepare into libLLVMCodeGen to avoid that. Follow-up of <rdar://problem/15519855> llvm-svn: 201912
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