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[IR/DIVar] Add the flag for params that have unmodified value

Authored by djtodoro on Jun 26 2019, 4:19 AM.

Description

[IR/DIVar] Add the flag for params that have unmodified value

Introduce the debug info flag that indicates that a parameter has unchanged
value throughout a function. This info will be used to emit the expressions
with DW_OP_entry_value.

([4/13] 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/D58034

llvm-svn: 364406