[patch, libgfortran] Bounds checking in date_and_time.c

[Thomas Koenig]

Hello world,

this rather simple patch is the last installment of PR 34670, bounds
checking for array intrinsics.  With this out of the way, we can finally
close this PR.

I didn't make the check dependent on compile_options.bounds_checking
because I didn't see an advantage in checking an additional condition.
Also, the pre-existing behavior means that we don't really break any
existing programs, we just make a cryptic error message a bit easier
to read.  Finally, I didn't add a test case, because I don't think such
a trivial thing is worth the added running time.  I am, however, willing
to be corrected on the last issue.

Regression-tested on x86_64-unknown-linux-gnu.  OK for trunk?

	Thomas

2010-06-03  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/34670
	* intrinsics/date_and_time.c:  Replace assert with runtime_error
	when VALUE is too small.

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