Howard Hinnant aab2305454
Seciton 24.2.2 of the C++ standard, [iterator.iterators], Table 106 ...
requires that the return type of *r for all iterators r be reference,
where reference is defined in [iterator.requirements.general]/p11 as
iterator_traits<X>::reference, and X is the type of r.
But in CFG.h, the dereference operator of PredIterator and SuccIterator
return pointer, not reference.
Furthermore the nested type reference is value_type&, which is not the
type returned from operator*().
This patch simply makes the iterator::reference type value_type*, which
is what the operator*() returns, and then re-lables the return type as
reference.
From a functionality point of view, the only difference is that the
nested reference type is now value_type* instead of value_type&.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178240 91177308-0d34-0410-b5e6-96231b3b80d8
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aab2305454