More progress on array initializers.

- Added Expr::isConstantExpr().
- Added type checking for InitListExpr elements.
- Added diagnostic for trying to initialize a variable sized object.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41674 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed