[WASM] Add array copy intrinsic

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

@@ -157,6 +157,7 @@ class WasmSymbols(
     val refIsNull = getInternalFunction("wasm_ref_is_null")
     val refTest = getInternalFunction("wasm_ref_test")
     val refCast = getInternalFunction("wasm_ref_cast")
+    val wasmArrayCopy = getInternalFunction("wasm_array_copy")
 
     val intToLong = getInternalFunction("wasm_i64_extend_i32_s")
 

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/dce/WasmUsefulDeclarationProcessor.kt

@@ -48,7 +48,8 @@ internal class WasmUsefulDeclarationProcessor(
             context.wasmSymbols.wasmInterfaceId,
             context.wasmSymbols.refCast,
             context.wasmSymbols.refTest,
-            context.wasmSymbols.boxIntrinsic -> {
+            context.wasmSymbols.boxIntrinsic,
+            context.wasmSymbols.wasmArrayCopy -> {
                 call.getTypeArgument(0)?.enqueueRuntimeClassOrAny(from, "intrinsic ${call.symbol.owner.name}")
                 true
             }

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

@@ -475,6 +475,13 @@ class BodyGenerator(
                 body.buildConstI32Symbol(WasmSymbol(context.scratchMemSizeInBytes))
             }
 
+            wasmSymbols.wasmArrayCopy -> {
+                val immediate = WasmImmediate.GcType(
+                    context.referenceGcType(call.getTypeArgument(0)!!.getRuntimeClass(irBuiltIns).symbol)
+                )
+                body.buildInstr(WasmOp.ARRAY_COPY, immediate, immediate)
+            }
+
             else -> {
                 return false
             }