[WebAssembly] Don't emit .import_global for the wasm target.

.import_global is used by the ELF-based target and not needed by the wasm
target.

llvm-svn: 319796
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
index ee60c8f..5f7f3d6 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -91,7 +91,8 @@
   for (const auto &G : M.globals()) {
     if (!G.hasInitializer() && G.hasExternalLinkage()) {
       uint16_t Size = M.getDataLayout().getTypeAllocSize(G.getValueType());
-      getTargetStreamer()->emitGlobalImport(G.getGlobalIdentifier());
+      if (TM.getTargetTriple().isOSBinFormatELF())
+        getTargetStreamer()->emitGlobalImport(G.getGlobalIdentifier());
       OutStreamer->emitELFSize(getSymbol(&G),
                                MCConstantExpr::create(Size, OutContext));
     }