Treat list-initialization of scalars as a first-class citizen in C++11.
Allow empty initializer lists for scalars, which mean value-initialization.
Constant evaluation for single-element and empty initializer lists for scalars.
Codegen for empty initializer lists for scalars.
Test case comes in next commit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140459 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed