[tuples][patch] Check for return value from gimplify_expr in gimplify_switch_expr

[Oleg Ryjkov]

Hi,

I'm adding a check for the return value from gimplify_expr to prevent
the construction of a GIMPLE_SWITCH from invalid operands.
Testing on i686-linux.
OK, provided no regressions?

Oleg

2008-03-28  Oleg Ryjkov  <olegr@google.com>

        * gimplify.c (gimplify_switch_expr): Verify the return value from
        gimplify_expr.
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