[fortran,patch] Fix PR 25252, error-recovery and ice-on-invalid

[FX Coudert <fxcoudert at gmail dot com>]

Attached patch fixes PR 25252, which is in fact two error-recovery  
and ice-on-invalid bugs in gfc_match_modproc(), the function that  
matches module procedure statements. The first part is to move the  
check for syntax error earlier in the loop. The second part is the  
recovery part: when we have a syntax error after having succesfully  
emitted code for some symbols (like "module procedure foo, bar, not  
=> allowed"), we used to no remove the already created symbols (foo  
and bar) from the interface, even though the symbols will be cleaned  
up in reject_statement(). Thus, the interface's sym- 
>interface.generic (if it's a generic interface, e.g.) was left with  
pointers to cleaned up memory. I counter this by resetting the  
interface to its previous state (creating two auxiliary functions in  
interface.c to help), and freeing the allocated gfc_interface's.

Bootstrapped and regtested on x86_64-linux, OK to commit?

FX



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