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[DebugInfo] Make InstrRange into a class, NFC

Authored by dstenb on Apr 10 2019, 2:07 AM.

Description

[DebugInfo] Make InstrRange into a class, NFC

Summary:
Replace use of std::pair by creating a class for the debug value
instruction ranges instead. This is a preparatory refactoring for
improving handling of clobbered fragments.

In an upcoming commit the Begin pointer will become a PointerIntPair, so
it will be cleaner to have a getter for that.

Reviewers: aprantl

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59938

llvm-svn: 358059

Details