[Wasm] change casts to reinterpreters (KT-78998)

Author: alex28sh

libraries/stdlib/wasm/builtins/kotlin/String.kt

@@ -186,7 +186,7 @@ internal fun stringLiteralLatin1(poolId: Int): String {
     val bytes = array_new_data0<WasmByteArray>(startAddress, length)
     val chars = WasmCharArray(length)
     for (i in 0..<length) {
-        val chr = bytes.get(i).toUByte().toInt().toChar()
+        val chr = bytes.getU(i).toByte().reinterpretAsInt().reinterpretAsChar()
         chars.set(i, chr)
     }
 

libraries/stdlib/wasm/src/generated/wasm/internal/_WasmArrays.kt

@@ -45,6 +45,10 @@ internal class WasmByteArray(size: Int) {
     fun get(index: Int): Byte =
         implementedAsIntrinsic
 
+    @WasmOp(WasmOp.ARRAY_GET_U)
+    fun getU(index: Int): UByte =
+        implementedAsIntrinsic
+
     @WasmOp(WasmOp.ARRAY_SET)
     fun set(index: Int, value: Byte): Unit =
         implementedAsIntrinsic