[WASM] Add command line option to enable/disable assertions

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmSymbols.kt

@@ -31,6 +31,8 @@ class WasmSymbols(
     private val symbolTable: SymbolTable
 ) : Symbols<WasmBackendContext>(context, context.irBuiltIns, symbolTable) {
 
+    private val kotlinTopLevelPackage: PackageViewDescriptor =
+        context.module.getPackage(FqName("kotlin"))
     private val wasmInternalPackage: PackageViewDescriptor =
         context.module.getPackage(FqName("kotlin.wasm.internal"))
     private val collectionsPackage: PackageViewDescriptor =
@@ -157,6 +159,7 @@ class WasmSymbols(
     val wasmRefCast = getInternalFunction("wasm_ref_cast")
 
     val rangeCheck = getInternalFunction("rangeCheck")
+    val assertFuncs = findFunctions(kotlinTopLevelPackage.memberScope, Name.identifier("assert"))
 
     val boxIntrinsic: IrSimpleFunctionSymbol = getInternalFunction("boxIntrinsic")
     val unboxIntrinsic: IrSimpleFunctionSymbol = getInternalFunction("unboxIntrinsic")

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/BodyGenerator.kt

@@ -259,9 +259,15 @@ class BodyGenerator(val context: WasmFunctionCodegenContext) : IrElementVisitorV
             return
         }
 
-        // Range check intrinsic is a special case because it doesn't require arguments on the stack.
-        if (call.symbol == wasmSymbols.rangeCheck &&
-            backendContext.configuration.getNotNull(JSConfigurationKeys.WASM_ENABLE_ARRAY_RANGE_CHECKS) == false) {
+        // Some intrinsics are a special case because we want to remove them completely, including their arguments.
+        val removableIntrinsics = buildList {
+            if (backendContext.configuration.getNotNull(JSConfigurationKeys.WASM_ENABLE_ARRAY_RANGE_CHECKS) == false)
+                add(wasmSymbols.rangeCheck)
+            if (backendContext.configuration.getNotNull(JSConfigurationKeys.WASM_ENABLE_ASSERTS) == false)
+                addAll(wasmSymbols.assertFuncs)
+        }
+
+        if (call.symbol in removableIntrinsics) {
             body.buildGetUnit()
             return
         }