[patch,avr,committed] Move disable of -fno-delete-null-pointer-checks to common.

[Georg-Johann Lay]

Applied the following patch that moves disabling of 
-fno-disable-null-pointer-checks to a different place so that it can be 
overwritten on the command-line (as opposed to TARGET_OVERRIDE_OPTIONS). 
  This allows some more test cases to pass that set 
-fdisable-null-pointer-checks.

gcc/
	* config/avr/avr.c (avr_option_override): Move disabling of
	-fdelete-null-pointer-checks to...
	* common/config/avr/avr-common.c (avr_option_optimization_table):
	...here.

gcc/testsuite/
	* gcc.dg/tree-ssa/vrp111.c (dg-options): Add
	-fdelete-null-pointer-checks.


Johann
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