[PATCH] UBSan: Teach isDerivedFromAtOffset and findBaseAtOffset about vbases

[David Majnemer]

Hi rsmith, samsonov,

When the __virtual_mask is set, __offset_flags >> __offset_shift yields
an offset into the vtable.  Dereferencing this vtable slot gets us the
vbase offset.

Adjust a test case to verify that this, in fact, works.

http://reviews.llvm.org/D6074

Files:
  lib/ubsan/ubsan_type_hash.cc
  test/ubsan/TestCases/TypeCheck/vptr.cpp
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