Handle CXXConstructorDecl, CXXDestructorDecl, and CXXConversionDecl for PCH.

<vector> header can be used correctly through PCH now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107483 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed