[llvm-objdump] Support disassembling by symbol name

Summary:
Add a new option -df to llvm-objdump that takes function names
as arguments and instructs the disassembler to only dump those function
contents. Based on code originally written by Bill Nell.

Reviewers: espindola, JDevlieghere

Differential Revision: https://reviews.llvm.org/D44224

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327164 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed