Fix addrspace when emitting constructors of static local variables

Summary:
Due to CUDA's implicit address space casting, the type of a static local
variable may be more specific (i.e. with address space qualifiers) than
the type expected by the constructor. Emit an addrspacecast in that
case.

Test Plan: Clang used to crash on the added test.

Reviewers: nlewycky, pcc, eliben, rsmith

Reviewed By: eliben, rsmith

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8575

llvm-svn: 233208