[PATCH 1/3] Add new keyword externally_initialized to LLVM.

[Michael Gottesman]

Hello LLVM Commits!

As decided in the email thread "[llvm-commits] [PATCH] Miscompile Fix: Ensure that we do not constant fold Globals containing ObjC References in GlobalOpt", we need a new keyword to represent the notion of a global variable that may be initialized at run time before user code is run by some ``external'' mechanism. Thus I propose we call said keyword ``externally_intialized''. This is the first of 3 patches to implement said keyword.

As a guide, the patches are organized as follows:

1. Add externally_initialized to LangRef.
2. Add support for externally_initialized to GlobalVariable via a boolean variable.
3. Add support to the llvm IR assembly writer/reader and the llvm IR bit code writer/reader to support reading/writing ``externally_initialized''.

Here is the first patch:

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Any pitchforks are appreciated. Please Review!

Michael