[Wasm] Introduce Xwasm-generate-wat compiler flag (disabled by default)

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -336,6 +336,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xwasm-enable-asserts", description = "Turn on asserts")
     var wasmEnableAsserts: Boolean by FreezableVar(false)
 
+    @Argument(value = "-Xwasm-generate-wat", description = "Generate wat file")
+    var wasmGenerateWat: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xuse-deprecated-legacy-compiler",
         description = "Use deprecated legacy compiler without error"

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -200,6 +200,7 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
 
         configuration.put(JSConfigurationKeys.WASM_ENABLE_ARRAY_RANGE_CHECKS, arguments.wasmEnableArrayRangeChecks)
         configuration.put(JSConfigurationKeys.WASM_ENABLE_ASSERTS, arguments.wasmEnableAsserts)
+        configuration.put(JSConfigurationKeys.WASM_GENERATE_WAT, arguments.wasmGenerateWat)
 
         val commonSourcesArray = arguments.commonSources
         val commonSources = commonSourcesArray?.toSet() ?: emptySet()
@@ -376,7 +377,7 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
                     baseFileName = outputName,
                     emitNameSection = arguments.wasmDebug,
                     allowIncompleteImplementations = arguments.irDce,
-                    generateWat = true,
+                    generateWat = configuration.get(JSConfigurationKeys.WASM_GENERATE_WAT, false),
                     generateSourceMaps = generateSourceMaps
                 )