[wasm] Fix test after r304117.

llvm-svn: 304164
diff --git a/llvm/test/CodeGen/WebAssembly/negative-base-reg.ll b/llvm/test/CodeGen/WebAssembly/negative-base-reg.ll
index 377966f..fc3a287 100644
--- a/llvm/test/CodeGen/WebAssembly/negative-base-reg.ll
+++ b/llvm/test/CodeGen/WebAssembly/negative-base-reg.ll
@@ -1,7 +1,7 @@
 ; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt | FileCheck %s
 
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
-target triple = "wasm32"
+target triple = "wasm32---elf"
 
 @args = hidden local_unnamed_addr global [32 x i32] zeroinitializer, align 16