[patch, fortran] Implement constant-folding for TRANSFER intrinsic.

[Brooks Moses]

This patch adds the long-awaited implementation for constant-folding for 
the TRANSFER intrinsic.  It's essentially the same as the provisional 
one that I posted a few weeks ago, with the addition of two testcases 
provided by Paul Thomas.

As noted earlier, this implementation is entirely independent of the 
build system's memory representation; all of the transfers of values 
from gfc_expr representations to memory representations are done using 
the middle-end functions in fold-const.c, which are what it uses for 
similar constant-folding.  The in-memory size of expressions is 
calculated using the same code as the fold-const.c functions use.

(As I shall have limited net access for the next week, Paul and FX have 
generously offered to address any final tweaks that need to be made to 
this.)

Regression tested on powerpc-apple-darwin8.9.0 (and slightly earlier 
versions tested on i686-pc-linux-gnu).  Ok for trunk?

- Brooks

---------------------------------------------------------------------
2007-05-11  Brooks Moses  <brooks.moses@codesourcery.com>

	PR fortran/18769
	PR fortran/30881
	PR fortran/31194
	PR fortran/31216
	PR fortran/31427
	* target-memory.c: New file.
	* target-memory.h: New file.
	* simplify.c: Add #include "target-memory.h".
	(gfc_simplify_transfer): Implement constant-
	folding for TRANSFER intrinsic.
	* Make-lang.in: Add dependencies on new target-memory.* files.

---------------------------------------------------------------------
2007-05-11  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/18769
	PR fortran/30881
	PR fortran/31194
	PR fortran/31216
	PR fortran/31427
	* transfer_simplify_1.f90: New test.
	* transfer_simplify_2.f90: New test.

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