Add { } to silence compiler warning [NFC]

At least clang 3.6 warns on the original code:

../tools/clang/lib/CodeGen/CGNonTrivialStruct.cpp:829:34: error: suggest braces around initialization of subobject [-Werror,-Wmissing-braces]
  return std::array<Address, 1>({Address(nullptr, CharUnits::Zero())});
                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                 {                                  }
../tools/clang/lib/CodeGen/CGNonTrivialStruct.cpp:833:34: error: suggest braces around initialization of subobject [-Werror,-Wmissing-braces]
  return std::array<Address, 2>({Address(nullptr, CharUnits::Zero()),
                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.

llvm-svn: 358152
1 file changed
tree: 64be32b2e4bc7d5f16ac435032e1176662be2c77
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. .arcconfig
  18. .clang-format
  19. .clang-tidy
  20. .gitignore
  21. README.md
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.