This is a POC patch. Before review, it needs more maturity.
This patch (10/N) stems from D69787
This enables debugger (using DW_OP_implicit_pointer) to display de-referenced value of pointer in case temporary is optimized out. It happens in case of reference or dynamic allocation.
-Added unit test for validation thru llvm IR
-check-llvm (LLDB need to be modifed to support this)
-check-debuginfo (the debug info integration tests)