[PATCH] Use NOP_EXPRs from genmatch

[Richard Biener]

This makes genmatch emit NOP_EXPRs instead of CONVERT_EXPRs.
This avoids various corner cases in passes, fold and FE-ish code.

Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.

Richard.

2014-10-31  Richard Biener  <rguent...@suse.de>

        * genmatch.c (expr::gen_transform): Use NOP_EXPRs instead of
        CONVERT_EXPRs in generated code.
        (dt_simplify::gen): Likewise.

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