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[IR] Add DISuprogram and DIE for a func decl

Description

[IR] Add DISuprogram and DIE for a func decl

A unique DISubprogram may be attached to a function declaration used for
call site debug info.

([6/13] Introduce the debug entry values.)

Co-authored-by: Ananth Sowda <asowda@cisco.com>
Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com>
Co-authored-by: Ivan Baev <ibaev@cisco.com>

Differential Revision: https://reviews.llvm.org/D60713