Create a WasmDumper subclass of ObjDumper to support Webassembly binary files. Patch by Sam Clegg Differential Revision: https://reviews.llvm.org/D27355 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293569 91177308-0d34-0410-b5e6-96231b3b80d8