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[MS] Fix late-parsed template infinite loop in eager instantiation

Authored by rnk on Mar 26 2018, 11:22 AM.

Description

[MS] Fix late-parsed template infinite loop in eager instantiation

Summary:
This fixes PR33561 and PR34185.

Don't store pending template instantiations for late-parsed templates in
the normal PendingInstantiations queue. Instead, use a separate list
that will only be parsed and instantiated at end of TU when late
template parsing actually works and doesn't infinite loop.

Reviewers: rsmith, thakis, hans

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D44846

llvm-svn: 328567