[gfortran] Implement CSHIFT

[Paul Brook]

The attached patch implements the CSHIFT intrinsic.

Applied to tree-ssa branch.

Paul

2003-10-12  Feng Wang  <wf_cs@yahoo.com>

	* iresolve.c (gfc_resolve_cshift): Change to match implementation.
	* trans-intrinsic.c (gfc_conv_intrinsic_function): Remove CSHIFT.
	(gfc_is_intrinsic_libcall): Add CSHIFT.
libgfortran
	* intrinsics/cshift0.c: New file.
	* m4/cshift1.m4: New file
	* generated/cshift*.c: New files.
	* Makefile.am: Add them.
	* Makefile.in: Regenerate.
testsuite
	* gfortran.fortran-torture/execute/intrinsic_cshift.f90: New test.
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