(fold): If moved conversion into COND_EXPR, leave it there if it is an...

(fold): If moved conversion into COND_EXPR, leave it there if it is an integral conversion to word or narrower.

(fold): If moved conversion into COND_EXPR, leave it there if it is an
integral conversion to word or narrower.
(fold, case NOP_EXPR): Ignore conversion to same type as operand.
(fold, case COND_EXPR): Make third operand the simplest.

From-SVN: r8467