[WebAssembly] Weak symbols should be defined in SF_Global

Summary:
This manifested itself in lld since it meant that weak
symbols were not appearing in archive symbol tables.

Subscribers: jfb, dschuff, jgravelle-google, aheejin

Differential Revision: https://reviews.llvm.org/D38111

llvm-svn: 313838

llvm/lib/Object/WasmObjectFile.cpp

@@ -769,7 +769,7 @@ uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
   DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
   if (Sym.isWeak())
     Result |= SymbolRef::SF_Weak;
-  else if (Sym.isGlobal())
+  if (!Sym.isLocal())
     Result |= SymbolRef::SF_Global;
 
   switch (Sym.Type) {