Recognize new clang and clang-tidy warnings.

* Count new clang-tidy warnings:
    google-runtime-references
    google-runtime-operator
* Count new clang warnings:
    -Wconst-conversion similar to -Wliteral-conversion
    -Wundefined-var-template
* Modified static analyzer warning message about
    "Null passed to a callee that requires a non-null ..."
* Disable google-runtime-references by default and
  disable misc-macro-parentheses in vendor projects;
  too many old C/C++ code have this warning.

Change-Id: Ib35e0af85875aada17c92b0237b76cd5ae3bfcc8
Test: build with clang-tidy.