[WebAssembly][lld] control __data_end export with config->shared

[quantum]

Summary

Emscripten expects __data_end to show up in PIC code as long as it's not
linked with --shared.

Currently, Emscripten breaks with latest LLVM because __data_end is controlled
by config->isPic instead of config->shared.`

[sbc100]

Great thanks.  Sorry I overlooked that in my last change.   Ideally we shouldn't be making this available in `-pie` either but for restoring the previous behaviour seems reasonable.

lld/wasm/Driver.cpp

530

Remove the curlies

[quantum]

Remove the curlies.

lld/wasm/Driver.cpp

WasmSym::initTLS = symtab->addSyntheticFunction(
         make<SyntheticFunction>(i32ArgSignature, "__wasm_init_tls"));
   }
 }
 
 static void createOptionalSymbols() {
   if (!config->relocatable)
     WasmSym::dsoHandle = symtab->addOptionalDataSymbol("__dso_handle");
 
-  if (!config->isPic) {
+  if (!config->shared)
     WasmSym::dataEnd = symtab->addOptionalDataSymbol("__data_end");
+
+  if (!config->isPic) {
     WasmSym::globalBase = symtab->addOptionalDataSymbol("__global_base");
     WasmSym::heapBase = symtab->addOptionalDataSymbol("__heap_base");
   }
 }
 
 // Reconstructs command line arguments so that so that you can re-run
 // the same command with the same inputs. This is for --reproduce.
 static std::string createResponseFile(const opt::InputArgList &args) {