[Wasm] Add compiler flag to disable exception handling proposal

Fail with unreachable instead of throwing an exception

Merge-request: KT-MR-11481
Merged-by: Svyatoslav Kuzmich <svyatoslav.kuzmich@jetbrains.com>

compiler/cli/cli-common/gen/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArgumentsCopyGenerated.kt

@@ -73,6 +73,7 @@ fun copyK2JSCompilerArguments(from: K2JSCompilerArguments, to: K2JSCompilerArgum
     to.wasmGenerateWat = from.wasmGenerateWat
     to.wasmKClassFqn = from.wasmKClassFqn
     to.wasmTarget = from.wasmTarget
+    to.wasmUseTrapsInsteadOfExceptions = from.wasmUseTrapsInsteadOfExceptions
 
     return to
 }

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

@@ -630,6 +630,16 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
             field = if (value.isNullOrEmpty()) null else value
         }
 
+    @Argument(
+        value = "-Xwasm-use-traps-instead-of-exceptions",
+        description = "Trap instead of throwing exceptions"
+    )
+    var wasmUseTrapsInsteadOfExceptions = false
+        set(value) {
+            checkFrozen()
+            field = value
+        }
+
     @Argument(
         value = "-Xforce-deprecated-legacy-compiler-usage",
         description = "The flag is used only for our inner infrastructure. It will be removed soon, so it's unsafe to use it nowadays."

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

@@ -170,6 +170,7 @@ 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)
+        configuration.put(JSConfigurationKeys.WASM_USE_TRAPS_INSTEAD_OF_EXCEPTIONS, arguments.wasmUseTrapsInsteadOfExceptions)
         configuration.putIfNotNull(JSConfigurationKeys.WASM_TARGET, arguments.wasmTarget?.let(WasmTarget::fromName))
 
         configuration.put(JSConfigurationKeys.OPTIMIZE_GENERATED_JS, arguments.optimizeGeneratedJs)