[PATCH 2/3] Add new keyword externally_initialized to LLVM.

[Michael Gottesman]

The following patch adds support for the new keyword externally_initialized to GlobalVariable.h/.cpp. It also adds in the desired functionality, ensuring that hasDefiniteInitializer (since even if all the values in different modules are the same the value can change) and hasUniqueInitializer (b/c again the value can change) return false when a variable is marked externally_initialized.

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Please Review,

Michael