[TargetOption] Add option to ebanble the debug entry values

The option enables debug info about parameter's entry values.

([2/13] 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/D60961

llvm-svn: 364395