[lldb] Always include template arguments that have their default value in the internal type name

Our type formatters/summaries match on the internal type name we generate in LLDB for Clang types.

These names were generated using Clang's default printing policy. However Clang's
default printing policy got tweaked over the last month to make the generated type
names more readable (by for example excluding inline/anonymous namespaces and
removing template arguments that have their default value). This broke the formatter
system where LLDB's matching logic now no longer can format certain types as
the new type names generated by Clang's default printing policy no longer match
the type names that LLDB/the user specified.

I already introduced LLDB's own type printing policy and fixed the inline/anonymous
namespaces in da121fff (just to get the
test suite passing again).

This patch is restoring the old type printing behaviour where always include the template
arguments in the internal type name (even if they match the default args). This should get
template type formatters/summaries working again in the rare situation where we do
know template default arguments within LLDB. This can only happen when either having
a template that was parsed in the expression parser or when we get type information from a C++ module.

The Clang change that removed defaulted template arguments from Clang's printing policy was
e7f3e210

Reviewed By: labath

Differential Revision: https://reviews.llvm.org/D92311