Implement support for variable length arrays in C++. VLAs are limited
in several important ways:

  - VLAs of non-POD types are not permitted.
  - VLAs cannot be used in conjunction with C++ templates.

These restrictions are intended to keep VLAs out of the parts of the
C++ type system where they cause the most trouble. Fixes PR5678 and
<rdar://problem/8013618>.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104443 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed