libclang: expose pointer-to-member type

[Che-Liang Chiou]

Conceptually the pointer-to-member type is, roughly speaking, a
composite of two types: the class type and the pointee type. This
patch adds clang_getClassType to Index.h which returns the class type
of a pointer-to-member, and extends clang_getPointeeType to return the
pointee type of a pointer-to-member. These two changes to the public
API should be the minimal amount of change needed for accessing
pointer-to-member type information.
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