[llvm-readobj] Switch command line parsing from llvm::cl to OptTable

Users should generally observe no difference as long as they don't use
unintended option forms. Behavior changes:

* `-t=d` is removed. Use `-t d` instead.
* `--demangle=false` and `--demangle=0` cannot be used. Omit the option or use `--no-demangle`. Other flag-style options don't have `--no-` forms.
* `--help-list` is removed. This is a `cl::` specific option.
* llvm-readobj now supports grouped short options as well.
* `--color` is removed. This is generally not useful (only apply to errors/warnings) but was inherited from Support.

Some adjustment to the canonical forms
(usually from GNU readelf; currently llvm-readobj has too many redundant aliases):

* --dyn-syms is canonical. --dyn-symbols is a hidden alias
* --file-header is canonical. --file-headers is a hidden alias
* --histogram is canonical. --elf-hash-histogram is a hidden alias
* --relocs is canonical. --relocations is a hidden alias
* --section-groups is canonical. --elf-section-groups is a hidden alias

OptTable avoids global option collision if we decide to support multiplexing for binary utilities.

* Most one-dash long options are still supported. `-dt, -sd, -st, -sr` are dropped due to their conflict with grouped short options.
* `--section-mapping=false` (D57365) is strange but is kept for now.
* Many `cl::opt` variables were unnecessarily external. I added `static` whenever appropriate.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D105532

1 files changed, 9 insertions, 9 deletions

diff --git a/llvm/tools/llvm-readobj/llvm-readobj.h b/llvm/tools/llvm-readobj/llvm-readobj.h
index d9813f5..43d19b4 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.h
+++ b/llvm/tools/llvm-readobj/llvm-readobj.h
@@ -32,15 +32,15 @@ namespace llvm {
 } // namespace llvm
 
 namespace opts {
-  extern llvm::cl::opt<bool> SectionRelocations;
-  extern llvm::cl::opt<bool> SectionSymbols;
-  extern llvm::cl::opt<bool> SectionData;
-  extern llvm::cl::opt<bool> ExpandRelocs;
-  extern llvm::cl::opt<bool> RawRelr;
-  extern llvm::cl::opt<bool> CodeViewSubsectionBytes;
-  extern llvm::cl::opt<bool> Demangle;
-  enum OutputStyleTy { LLVM, GNU };
-  extern llvm::cl::opt<OutputStyleTy> Output;
+extern bool SectionRelocations;
+extern bool SectionSymbols;
+extern bool SectionData;
+extern bool ExpandRelocs;
+extern bool RawRelr;
+extern bool CodeViewSubsectionBytes;
+extern bool Demangle;
+enum OutputStyleTy { LLVM, GNU };
+extern OutputStyleTy Output;
 } // namespace opts
 
 #define LLVM_READOBJ_ENUM_ENT(ns, enum) \