Change how we suppress access control in explicit instantiations
so that we actually accumulate all the delayed diagnostics.  Do
this so that we can restore those diagnostics to good standing
if it turns out that we were wrong to suppress, e.g. if the
tag specifier is actually an elaborated type specifier and not
a declaration.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156291 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed