[PATCH] Update if-conversion for AV

[Devang Patel <dpatel at apple dot com>]

This small patch updates if-conversion such that if-converted
loops are suitable for auto-vectorization. This patch includes
two changes: 1) Avoid/delay creating temp. for exit cond. 2)
Merge header and exit block so that vectorizer receives loop
with 2 nodes only.

Bootstrapped and tested on powerpc-darwin.

OK?
Thanks,
-
Devang

2004-09-15  Devang Patel  <dpatel@apple.com>

        * tree-if-conv.c (tree_if_convert_cond_expr): Creating temp. 
variable only
        when necessary.
        (combine_blocks): Combine loop header and exit block.

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