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

This reverts commit 917a99b71ce21c975be7bfbf66f4040f965d9f3c.

llvm-svn: 339630
diff --git a/llvm/test/CodeGen/WebAssembly/implicit-def.ll b/llvm/test/CodeGen/WebAssembly/implicit-def.ll
index de8262d..da66be9 100644
--- a/llvm/test/CodeGen/WebAssembly/implicit-def.ll
+++ b/llvm/test/CodeGen/WebAssembly/implicit-def.ll
@@ -1,4 +1,4 @@
-; RUN: llc -o - %s -asm-verbose=false -wasm-explicit-locals-codegen-test-mode | FileCheck %s
+; RUN: llc -o - %s -asm-verbose=false | FileCheck %s
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
 target triple = "wasm32-unknown-unknown"