[WebAssembly] Register wasm passes with the PassRegistry

Summary:
This exposes WebAssembly passes for use on the command line (as
arguments to -print-before and the like).

Reviewers: dschuff, sunfish

Subscribers: MatzeB, jfb, sbc100, llvm-commits, aheejin

Differential Revision: https://reviews.llvm.org/D45103

llvm-svn: 328901
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyArgumentMove.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyArgumentMove.cpp
index 5fadca3..aaa1e4e 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyArgumentMove.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyArgumentMove.cpp
@@ -60,6 +60,9 @@
 } // end anonymous namespace
 
 char WebAssemblyArgumentMove::ID = 0;
+INITIALIZE_PASS(WebAssemblyArgumentMove, DEBUG_TYPE,
+                "Move ARGUMENT instructions for WebAssembly", false, false)
+
 FunctionPass *llvm::createWebAssemblyArgumentMove() {
   return new WebAssemblyArgumentMove();
 }