Initial support for struct-path aware TBAA.
Added TBAABaseType and TBAAOffset in LValue. These two fields are initialized to the actual type and 0, and are updated in EmitLValueForField. Path-aware TBAA tags are enabled for EmitLoadOfScalar and EmitStoreOfScalar. Added command line option -struct-path-tbaa. llvm-svn: 178797
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