CXXRecordDecl: Split getBases/getVBases into a slow and a fast path.

This avoids costly computation of getASTContext() and drops the header
dependency from DeclCXX.h to ASTContext.h.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159716 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed