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Extend Module::getOrInsertGlobal to control the construction of the

Description

Extend Module::getOrInsertGlobal to control the construction of the
GlobalVariable

Summary:
Extend Module::getOrInsertGlobal to accept a callback for creating a new
GlobalVariable if necessary instead of calling the GV constructor
directly using default arguments. Additionally overload
getOrInsertGlobal for the previous default behavior.

Reviewers: chandlerc

Subscribers: hiraditya, llvm-commits, bollu

Differential Revision: https://reviews.llvm.org/D56130