[llvm-objdump] Align instructions to a tab stop in disassembly output

[llvm-objdump] Align instructions to a tab stop in disassembly output

Summary:
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

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60376

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358405 91177308-0d34-0410-b5e6-96231b3b80d8