CGDecl: Skip static variable initializers in unreachable code This fixes http://llvm.org/PR31054 Differential Revision: https://reviews.llvm.org/D28505 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291576 91177308-0d34-0410-b5e6-96231b3b80d8