[LLVMdev] Allow default member initializers in LLVM

[Reid Kleckner]

Default member initializers (or non-static data member initializers if you
like) are these things:
  struct Foo {
    int x = -1;
    int y = 0xdeadbeef;
  };

I'd like to use them, because I'm tired of updating out-of-line
constructors to explicitly initialize all scalar members. See for example
CodeGenFunction():
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenFunction.cpp?revision=235664&view=markup#l37

This feature is supported by MSVC 2013, Clang 3.0, and GCC 4.7, which
together represent our platform support floor.

Any objections? If not, I'll update
http://llvm.org/docs/CodingStandards.html in a few days.

I'll also put in a word recommending that these should only be used to
initialize scalars to constant values. C++ is very flexible and will let
you put lots of stuff here, but doing so is probably bad form.
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