[patch, fortran] PR34858, PR33375 - properly undo temporary symbols from common blocks

[Daniel Franke]

PR34858, an error-recovery issue, turned out to be the same as PR33375 
(regression in gfortran.dg/common_6.f90) which was assumed fixed. This patch 
reverts the previous patch and properly resets changes in common blocks 
instead.


2008-01-24  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/33375
	PR fortran/34858
	* gfortran.h: Revert changes from 2008-01-17.
	* match.c: Likewise.
	* symbol.c: Likewise.
	(gfc_undo_symbols): Undo namespace changes related to common blocks.


Regression tested without regressions on intel-darwin9 by Dominique and 
i686-pc-linux-gnu by me. Ok for trunk?

Regards
	Daniel
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