[gfortran,commited] Fix LBOUND and UBOUND intrinsics

[François-Xavier Coudert]

Hi all,

I commited the attached patch to mainline (rev. 117691) so that
gfortran generates correct code for LBOUND and UBOUND intrinsics
(which were broken in a large number of cases, see PR29391).

It was OKed by Paul Thomas on IRC, and regtested on x86_64-linux. I
intend to backport the patch to the 4.1 branch in a week or so.

	PR fortran/29391

	* trans-intrinsic.c (gfc_conv_intrinsic_bound): Generate correct
	code for LBOUND and UBOUND intrinsics.

	* gfortran.dg/bound_2.f90: New test.
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