WASM: NFC. Remove dead code

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

@@ -98,36 +98,6 @@ fun WasmCompiledModuleFragment.generateJs(): String {
     var wasmInstance = null;
     
     const runtime = {
-        String_getChar(str, index) {
-            return str.charCodeAt(index);
-        },
-
-        String_compareTo(str1, str2) {
-            if (str1 > str2) return 1;
-            if (str1 < str2) return -1;
-            return 0;
-        },
-
-        String_equals(str, other) {
-            return str === other;
-        },
-
-        String_subsequence(str, startIndex, endIndex) {
-            return str.substring(startIndex, endIndex);
-        },
-
-        String_getLiteral(index) {
-            return runtime.stringLiterals[index];
-        },
-
-        coerceToString(value) {
-            return String(value);
-        },
-
-        Char_toString(char) {
-            return String.fromCharCode(char)
-        },
- 
         identity(x) {
             return x;
         },

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

@@ -69,23 +69,3 @@ public class String internal constructor(internal val chars: CharArray) : Compar
 }
 
 internal fun stringLiteral(startAddr: Int, length: Int) = String(unsafeRawMemoryToCharArray(startAddr, length))
-
-//@JsFun("(it, other) => it + String(other)")
-//private fun stringPlusImpl(it: String, other: String): String =
-//    implementedAsIntrinsic
-//
-//@JsFun("(it) => it.length")
-//private fun stringLengthImpl(it: String): Int =
-//    implementedAsIntrinsic
-//
-//@WasmImport("runtime", "String_getChar")
-//private fun stringGetCharImpl(it: String, index: Int): Char =
-//    implementedAsIntrinsic
-//
-//@WasmImport("runtime", "String_compareTo")
-//private fun stringCompareToImpl(it: String, other: String): Int =
-//    implementedAsIntrinsic
-//
-//@WasmImport("runtime", "String_subsequence")
-//private fun stringSubSequenceImpl(string: String, startIndex: Int, endIndex: Int): String =
-//    implementedAsIntrinsic