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[clang] Make handling of unnamed template params similar to function params

Authored by kadircet on Oct 1 2019, 7:08 AM.

Description

[clang] Make handling of unnamed template params similar to function params

Summary:
Clang uses the location identifier should be inserted for declarator
decls when a decl is unnamed. But for type template and template template
paramaters it uses the location of "typename/class" keyword, which makes it hard
for tooling to insert/change parameter names.

This change tries to unify these two cases by making template parameter
parsing and sourcerange operations similar to function params/declarator decls.

Reviewers: ilya-biryukov

Subscribers: arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68143

llvm-svn: 373340