[CMake] clangCodeGen: Update libdeps to add clangLex for PPChainedCallbacks.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@214869 91177308-0d34-0410-b5e6-96231b3b80d8
ASTMatchers.h: Fix an annotation. [-Wdocumentation-html]

Angle brackets, aka &lt; &gt;, should be escaped.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@214870 91177308-0d34-0410-b5e6-96231b3b80d8