[PATCH, middle-end]: Fix PR middle-end/30667

[Uros Bizjak]

Hello!

In combine.c, try_combine() we have to prevent constant wider than
HOST_BITS_PER_WIDE_INT * 2  from entering  immed_double_host().

Patch was bootstrapped & regression tested on i686-pc-linux-gnu for
all default langugages.

2007-02-02  Uros Bizjak  <ubizjak@gmail.com>

	* combine.c (try_combine): Do not substitute source operand
	with constants wider than 2 * HOST_BITS_PER_WIDE_INT.

testsuite/ChangeLog:

2007-02-02  Uros Bizjak  <ubizjak@gmail.com>

	* gfortran.dg/pr30667.f: New test.

Uros.
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