[llvm-objdump] Align instructions to a tab stop in disassembly output
In GNU objdump, -w/--wide aligns instructions in the disassembly output.
This patch does the same to llvm-objdump. However, we always use the
wide format (-w/--wide is ignored), because the narrow format
(instructions are misaligned) is probably not very useful.
In llvm-readobj, we made a similar decision: always use the wide format,
accept but ignore -W/--wide.
To save some columns, we change the tab before hex bytes (controlled by
--[no-]show-raw-insn) to a space.
Reviewers: rupprecht, jhenderson, grimar
Reviewed By: jhenderson
Differential Revision: https://reviews.llvm.org/D60376