[PATCH] ADT: Remove misaligned pointeres from DenseMapInfo

[David Majnemer]

Hi samsonov, rsmith, hfinkel, nicholas, nlewycky, chandlerc,

C++ requires that pointers point to sufficiently well aligned addresses.
getEmptyKey() and getTombstoneKey() would cast -1 and -2 to arbitrary
pointer types which would violate this requirement.

In an ideal world, we would query the alignment of the pointee type;
however, the pointee type might be incomplete (this is often the case in
LLVM/Clang). Instead, assume that no type is more aligned than 16383
bytes.

http://reviews.llvm.org/D5428

Files:
  include/llvm/ADT/DenseMapInfo.h
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