{patch, fortran] PR38718: add simplifier for MERGE

[Daniel Franke]

Hi all.

MERGE is an elemental intrinsic function and as such allowed in initialization 
expressions. However, up until now, there was no simplifier for MERGE, thus 
init expr using it were rejected (not directly but with a somewhat cryptic 
error). 

The PR lists more elemental functions were simplifiers are missing, but MERGE 
is the only one from F95.


gcc/fortran:
2009-01-04  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/38718
	* simplify.c (gfc_simplify_merge): New.
	* intrinsic.h (gfc_simplify_merge): New prototype.
	* intrinsic.c (add_functions): Added simplification for MERGE.

gcc/testsuite:
2009-01-04  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/38718
	* gfortran.dg/merge_init_expr.f90: New.


Regression tested on i686-pc-linux-gnu. Ok for trunk?

Regards

	Daniel

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