[PR c++/20022, obvious] fix -fno-access-control crash

[Alexandre Oliva]

We shouldn't assume deferred_access_stack is initialized and
short-circuit the call to get_deferred_access_check().  This patch
fixes -fno-access-control such that it doesn't crash for any
non-trivial testcase.  I'm checking it in as obvious.  Tested on
x86_64-linux-gnu.

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}