...where plain operator new/delete are reportedly predefined (cf.
<www.geoffchappell.com/studies/msvc/language/predefined/index.html>) without any
exception specs, then redeclared in C:/PROGRA~2/MICROS~1.0/VC/include/new with
exception specs that are ignored by MSVC (so it presumably doesn't even complain
about the mismatching redeclarations, just effectively ignores them); and array
operator new/delete are declared in C:/PROGRA~2/MICROS~1.0/VC/include/crtdbg.h
without any exception specs.  clang-cl would warn about those inconsistencies.

Change-Id: I4dd15e4cfcedc3de5e8617b43769b5371cafa71f