• [iwyu] Fix crash due to undefined behavior in AST traversal
• [iwyu] Improve handling of operator new including C++17 features
• [iwyu] Improve handling of templates
• [iwyu_tool] Remove known compiler wrappers from the command list
• [mappings] Improve Qt mapping generator
• [mappings] Improve boost mappings
• [mappings] Improve built-in mappings for <time.h>
• [mappings] Add built-in mappings for max_align_t, ptrdiff_t, and wchar_t
• [cmake] Support shared LLVM/Clang libraries and other improvements