JVM IR: Remove type substitutions from ExpressionCodegen

Instead, determine whether the return type of a call is Nothing, by
looking at the type of the call expression.

compiler/testData/codegen/box/bridges/kt1959.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 open class A<T> {
     open fun f(args : Array<T>) {}
 }

compiler/testData/codegen/box/bridges/overrideAbstractProperty.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 public abstract class AbstractClass<T> {
     public abstract val some: T
 }