Remove unnecessary codes in llvm-dwarfdump

[duongnhn]

Summary

These codes is not needed.
Remove them can reduce the size in x64 window build from ~14MB to ~3MB.

[jakehehrlich]

I'm not sure why I was added but this looks fine to me. If it compiles and runs on everyone's system I can't see how this could be anything but good.

[duongnhn]

In D68886#1706567, @jakehehrlich wrote:

I'm not sure why I was added but this looks fine to me. If it compiles and runs on everyone's system I can't see how this could be anything but good.

Sorry, I'm not able to find the exact owner for this so I thought you might be related.

[rupprecht]

Does check-all pass with this change? I'd imagine these are necessary to print target-specific information.

[duongnhn]

In D68886#1706821, @rupprecht wrote:

Does check-all pass with this change? I'd imagine these are necessary to print target-specific information.

You are right --all options is not working properly with this. I will delete this.

llvm/tools/llvm-dwarfdump/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
   DebugInfoDWARF
-  AllTargetsDescs
-  AllTargetsInfos
-  MC
   Object
   Support
   )
 
 add_llvm_tool(llvm-dwarfdump
   Statistics.cpp
   llvm-dwarfdump.cpp
   )
 
 add_subdirectory(fuzzer)

llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp

static std::vector<std::string> expandBundle(const std::string &InputPath) {
   if (!BundlePaths.size())
     BundlePaths.push_back(InputPath);
   return BundlePaths;
 }
 
 int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
 
-  llvm::InitializeAllTargetInfos();
-  llvm::InitializeAllTargetMCs();
-
   HideUnrelatedOptions({&DwarfDumpCategory, &SectionCategory, &ColorCategory});
   cl::ParseCommandLineOptions(
       argc, argv,
       "pretty-print DWARF debug information in object files"
       " and debug info archives.\n");
 
   // FIXME: Audit interactions between these two options and make them
   //        compatible.