Use ISE instead of NPE in serialization

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt

@@ -392,3 +392,15 @@ inline fun IrBuilderWithScope.irBlockBody(
         startOffset,
         endOffset
     ).blockBody(body)
+
+fun IrBuilderWithScope.irThrowIse(origin: IrStatementOrigin? = null) =
+    IrCallImpl(
+        startOffset, endOffset,
+        context.irBuiltIns.nothingType,
+        context.irBuiltIns.throwIseSymbol,
+        context.irBuiltIns.throwIseSymbol.descriptor,
+        typeArgumentsCount = 0,
+        valueArgumentsCount = 0,
+        origin = origin
+    )
+

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrBuiltIns.kt

@@ -295,7 +295,6 @@ class IrBuiltIns(
         const val EQEQ = "EQEQ"
         const val EQEQEQ = "EQEQEQ"
         const val IEEE754_EQUALS = "ieee754equals"
-        const val THROW_NPE = "THROW_NPE"
         const val THROW_CCE = "THROW_CCE"
         const val THROW_ISE = "THROW_ISE"
         const val NO_WHEN_BRANCH_MATCHED_EXCEPTION = "noWhenBranchMatchedException"

plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerializerIrGenerator.kt

@@ -351,7 +351,7 @@ class SerializerIrGenerator(val irClass: IrClass, override val compilerContext:
                 +irSetVar(indexVar.symbol, irInvoke(localInput.get(), readElementF, localSerialDesc.get()))
                 +irWhen {
                     // if index == -2 (READ_ALL) todo...
-                    +IrBranchImpl(irEquals(indexVar.get(), irInt(-2)), irThrowNpe())
+                    +IrBranchImpl(irEquals(indexVar.get(), irInt(-2)), irThrowIse()) // TODO throw proper exception
 
                     // if index == -1 (READ_DONE) break loop
                     +IrBranchImpl(irEquals(indexVar.get(), irInt(-1)), irSetVar(flagVar.symbol, irBoolean(false)))
@@ -436,7 +436,7 @@ class SerializerIrGenerator(val irClass: IrClass, override val compilerContext:
         if (serializableDescriptor.modality != Modality.ABSTRACT && serializableDescriptor.modality != Modality.SEALED) {
             +irReturn(irInvoke(null, ctor, typeArgs, args))
         } else {
-            +irThrowNpe()
+            +irThrowIse() // TODO throw proper exception
         }
     }