Revert "[WebAssembly] Added default stack-only instruction mode for MC."

This reverts commit d3c9af4179eae7793d1487d652e2d4e23844555f.
(SVN revision 338164)

llvm-svn: 338176
diff --git a/llvm/test/CodeGen/WebAssembly/function-bitcasts.ll b/llvm/test/CodeGen/WebAssembly/function-bitcasts.ll
index 2eff0d6..d3553a4 100644
--- a/llvm/test/CodeGen/WebAssembly/function-bitcasts.ll
+++ b/llvm/test/CodeGen/WebAssembly/function-bitcasts.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -asm-verbose=false -wasm-register-codegen-test-mode -enable-emscripten-cxx-exceptions -wasm-temporary-workarounds=false | FileCheck %s
+; RUN: llc < %s -asm-verbose=false -disable-wasm-explicit-locals -enable-emscripten-cxx-exceptions -wasm-temporary-workarounds=false | FileCheck %s
 
 ; Test that function pointer casts are replaced with wrappers.