CodeGen: Fix a typo in a comment

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219780 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Use the initing member's type for a union's storage type more often

Unions are initialized with the default initialization of their first
named member.  If that member is not zero initialized, then we should
prefer that member's type.  Otherwise, we might try to make an otherwise
unsuitable type (like an array) which we cannot easily initialize with a
pointer to member.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219781 91177308-0d34-0410-b5e6-96231b3b80d8