[Wasm] Disable range checks for arrays. Add cli argument to enable them back.

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

@@ -156,6 +156,8 @@ class WasmSymbols(
 
     val wasmRefCast = getInternalFunction("wasm_ref_cast")
 
+    val rangeCheck = getInternalFunction("rangeCheck")
+
     val boxIntrinsic: IrSimpleFunctionSymbol = getInternalFunction("boxIntrinsic")
     val unboxIntrinsic: IrSimpleFunctionSymbol = getInternalFunction("unboxIntrinsic")
 

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

@@ -30,6 +30,7 @@ import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.js.config.JSConfigurationKeys
 import org.jetbrains.kotlin.wasm.ir.*
 
 class BodyGenerator(val context: WasmFunctionCodegenContext) : IrElementVisitorVoid {
@@ -258,6 +259,13 @@ 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) {
+            body.buildGetUnit()
+            return
+        }
+
         val function: IrFunction = call.symbol.owner.realOverrideTarget
 
         call.dispatchReceiver?.let { generateExpression(it) }