[WebAssembly] Remove use of lld -flavor flag

This flag is deprecated. The preferred way to select the lld
flavor is by calling it by one of its aliases.

Differential Revision: https://reviews.llvm.org/D50395

llvm-svn: 339163
diff --git a/clang/lib/Driver/ToolChains/WebAssembly.h b/clang/lib/Driver/ToolChains/WebAssembly.h
index cdbb34f..b69549a 100644
--- a/clang/lib/Driver/ToolChains/WebAssembly.h
+++ b/clang/lib/Driver/ToolChains/WebAssembly.h
@@ -66,9 +66,7 @@
                            llvm::opt::ArgStringList &CmdArgs) const override;
   std::string getThreadModel() const override;
 
-  const char *getDefaultLinker() const override {
-    return "lld";
-  }
+  const char *getDefaultLinker() const override { return "wasm-ld"; }
 
   Tool *buildLinker() const override;
 };