Fix bool LPE.

Boolean LPE has a wrong way to transform operand, selecting it when transform.

To fis it I call always to the existing function to inform all LPE when a transform is done. By default all LPE are marked to ignore if the LPE previously ignore it, except in bool LPE where we use it to transform operand.

Fixed issue #772 (closed). Fixed issue #1076 (closed). Fixed issue #1148 (closed).

(cherry picked from commit 3274e7a1)