[Webassembly] disable unstable test.

It reads uninitialized memory and crashes randomly.

llvm-svn: 278495
diff --git a/llvm/test/CodeGen/WebAssembly/dbgvalue.ll b/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
index 0bdf4f2..37f4827 100644
--- a/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
+++ b/llvm/test/CodeGen/WebAssembly/dbgvalue.ll
@@ -1,4 +1,6 @@
 ; RUN: llc < %s -O0 -verify-machineinstrs -mtriple=wasm32-unknown-unknown | FileCheck %s
+; REQUIRES: disabled
+
 ; CHECK: BB#0
 ; CHECK: #DEBUG_VALUE: usage:self <- %vreg4
 ; CHECK: BB#1