When making native-wasm or asmjs only builds, lets avoid some of the code from being included into resulting JavaScript code (more code will be removed by closure compiler) (#5371)

AUTHORS

@@ -297,3 +297,4 @@ a license to everyone to use it as detailed in LICENSE.)
 * Matjaž Drolc <mdrolc@gmail.com>
 * James Swift <james@3dengineer.com> (copyright owned by PSPDFKit GmbH)
 * Ryan Lester <ryan@cyph.com> (copyright owned by Cyph, Inc.)
+* Nazar Mokrynskyi <nazar@mokrynskyi.com>

src/preamble.js

@@ -2496,6 +2496,12 @@ function integrateWasmJS(Module) {
     // try the methods. each should return the exports if it succeeded
 
     var exports;
+#if BINARYEN_METHOD == 'native-wasm'
+    exports = doNativeWasm(global, env, providedBuffer);
+#else
+#if BINARYEN_METHOD == 'asmjs'
+    exports = doJustAsm(global, env, providedBuffer);
+#else
     var methods = method.split(',');
 
     for (var i = 0; i < methods.length; i++) {
@@ -2519,6 +2525,8 @@ function integrateWasmJS(Module) {
     }
 
     if (!exports) throw 'no binaryen method succeeded. consider enabling more options, like interpreting, if you want that: https://github.com/kripken/emscripten/wiki/WebAssembly#binaryen-methods';
+#endif
+#endif
 
 #if RUNTIME_LOGGING
     Module['printErr']('binaryen method succeeded.');