* lto-symtab.c: Include alias.h
(warn_type_compatibility_p): Replace types_compatible_p checks by
TBAA and size checks; set bit 2 if locations are TBAA incompatible.
(lto_symtab_merge): Compare DECL sizes.
(lto_symtab_merge_decls_2): Warn about TBAA in compatibility.
* gfortran.dg/lto/bind_c-6_0.f90: New testcase.
* gfortran.dg/lto/bind_c-6_1.c: New testcase.
From-SVN: r230911
