[wasm][IRGen] HACK: Disable stack protection

This is a temporary workaround until we can update wasi-sdk to version
17 or later, which includes stack protection support in wasi-libc.
WebAssembly/wasi-libc@8b7148f

Author: kateinoigakukun

lib/IRGen/GenDecl.cpp

@@ -3358,7 +3358,8 @@ llvm::CallBase *swift::irgen::emitCXXConstructorCall(
 
 StackProtectorMode IRGenModule::shouldEmitStackProtector(SILFunction *f) {
   const SILOptions &opts = IRGen.SIL.getOptions();
-  return (opts.EnableStackProtection && f->needsStackProtection()) ?
+  // FIXME(katei): stack protection support will be added by https://github.com/WebAssembly/wasi-libc/pull/351
+  return (opts.EnableStackProtection && f->needsStackProtection() && Triple.getObjectFormat() != llvm::Triple::Wasm) ?
     StackProtectorMode::StackProtector : StackProtectorMode::NoStackProtector;
 }