This adds the following as subgroups of -Wgnu: -Wgnu-alignof-expression,
-Wgnu-case-range, -Wgnu-complex-integer, -Wgnu-conditional-omitted-operand,
-Wgnu-empty-initializer, -Wgnu-label-as-value, -Wgnu-local-label,
and -Wgnu-statement-expression,

Patch by Peter Lewis.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188839 91177308-0d34-0410-b5e6-96231b3b80d8