This patch (2/N) stems from D69787
It is suggested by @aprantl
New dwarf operator DW_OP_LLVM_implicit_pointer is introduced (present only in LLVM IR)
This is needed ecause representation and specification (types of operands) of it a bit different that actual dwarf expression DW_OP_LLVM_implicit_pointer. while creating actual dwarf info it will be converted to DW_OP_LLVM_implicit_pointer.
- llvm-as, llvm-dis
- check-debuginfo (the debug info integration tests)