[gfortran,patch] Fix multiple evaluation of index with bounds checking

[FX Coudert]

Acting on Andrew's suggestion, I changed the patch to use the  
save_expr() function. And since it's a simple one-line patch, I  
finally decided to go ahead and commit it as rev. 126647, after a  
final regtesting with -fbounds-check on x86_64-linux.

FX


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