Improve handling of bool expressions in template arguments.

Now correctly formats:
  foo<true && false>();

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204950 91177308-0d34-0410-b5e6-96231b3b80d8
Fix PR18307: Properly (de)serialize inherited constructors and their using declarations

Reviewed in http://llvm-reviews.chandlerc.com/D3102

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204951 91177308-0d34-0410-b5e6-96231b3b80d8