Make types with sizes that aren't a power of two an error (that can
be disabled) in structs with ms_struct layout, except on mingw where
the situation is quite likely to occur and GCC handles it silently.
Differential Revision: https://reviews.llvm.org/D43908
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@326476 91177308-0d34-0410-b5e6-96231b3b80d8
Martin Storsjo