[WebAssembly][NFC] Move specific instruction formats to specific files

Summary:
WebAssemblyInstrFormats.td retains only multiclasses that are used in
multiple other tablegen files.

Reviewers: aheejin, dschuff

Subscribers: sbc100, jgravelle-google, sunfish, jfb, llvm-commits

Differential Revision: https://reviews.llvm.org/D51143

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340503 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed