[modules] Don't diagnose a conflict between two using-declarations that name equivalent internal linkage entities.llvm-svn: 257512
[modules] When performing redeclaration lookup for a using declaration, preferUsingShadowDecls over other declarations of the same entity in the lookupresults. This ensures that we build correct re
[modules] When performing redeclaration lookup for a using declaration, preferUsingShadowDecls over other declarations of the same entity in the lookupresults. This ensures that we build correct redeclaration chains for theUsingShadowDecls (otherwise we could see assertions and other misbehavior inmodules builds, when merging combines multiple redeclaration chains for thesame entity from the same module into one chain).llvm-svn: 243592
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