Support JVM polymorphic signature calls to methods with void return type

#KT-32026 Fixed

compiler/testData/codegen/box/polymorphicSignature/varargOfObjects_after.kt

@@ -47,5 +47,16 @@ fun box(): String {
     val r8 = mh.invoke(arrayOf(args))
     if (r8 !is Array<*> || !r8.contentEquals(args)) return "Fail 8: $r8"
 
+    // The next two calls check behavior in a statement context (where the call result is not used)
+
+    try {
+        mh.invokeExact(args)
+        return "Fail 9"
+    } catch (e: WrongMethodTypeException) {
+        // OK
+    }
+
+    mh.invoke(args)
+
     return "OK"
 }

compiler/testData/codegen/box/polymorphicSignature/varargOfObjects_before.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: -PolymorphicSignature
 // IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 // FULL_JDK
@@ -44,5 +45,11 @@ fun box(): String {
     val r8 = mh.invoke(arrayOf(args))
     if (r8 !is Array<*> || r8[0] !is Array<*> || !(r8[0] as Array<*>).contentEquals(args)) return "Fail 8: $r8"
 
+    // The next two calls check behavior in a statement context (where the call result is not used)
+
+    mh.invokeExact(args)
+
+    mh.invoke(args)
+
     return "OK"
 }

compiler/testData/codegen/box/polymorphicSignature/voidReturnType.kt

@@ -0,0 +1,28 @@
+// !LANGUAGE: +PolymorphicSignature
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// FULL_JDK
+// SKIP_JDK6
+// WITH_RUNTIME
+
+import java.lang.invoke.MethodHandles
+import java.lang.invoke.MethodType
+
+var state = "Fail"
+
+class C {
+    fun foo(s: String) {
+        state = s
+    }
+}
+
+fun box(): String {
+    val mh = MethodHandles.lookup().findVirtual(
+        C::class.java, "foo",
+        MethodType.methodType(Void.TYPE, String::class.java)
+    )
+
+    mh.invokeExact(C(), "OK")
+
+    return state
+}