JVM IR: Avoid direct invokes in callable reference tests

Due to the direct invoke optimization, most callable reference tests
were not generating callable references/lambdas.

compiler/testData/codegen/box/callableReference/bound/arrayGetIntrinsic.kt

@@ -1,4 +1,4 @@
 
 fun box(): String {
-    return if ((arrayOf(1, 2, 3)::get)(1) == 2) "OK" else "Fail"
+    return if ((arrayOf(1, 2, 3)::get).let { it(1) } == 2) "OK" else "Fail"
 }

compiler/testData/codegen/box/callableReference/bound/companionObjectReceiver.kt

@@ -5,4 +5,4 @@ class A {
     }
 }
 
-fun box() = (A.Companion::ok)()
+fun box() = (A.Companion::ok).let { it() }

compiler/testData/codegen/box/callableReference/bound/emptyLHS.kt

@@ -7,11 +7,11 @@ class A {
     val aMemberProperty: Int get() = 42.also { result += "A.amp," }
 
     fun test(): String {
-        (::memberFunction)()
-        (::aExtensionFunction)()
+        (::memberFunction).let { it() }
+        (::aExtensionFunction).let { it() }
 
-        (::memberProperty)()
-        (::aExtensionProperty)()
+        (::memberProperty).let { it() }
+        (::aExtensionProperty).let { it() }
 
         return result
     }
@@ -21,17 +21,17 @@ class A {
         val memberProperty: Int get() = 42.also { result += "B.mp," }
 
         fun test(): String {
-            (::aMemberFunction)()
-            (::aExtensionFunction)()
+            (::aMemberFunction).let { it() }
+            (::aExtensionFunction).let { it() }
 
-            (::aMemberProperty)()
-            (::aExtensionProperty)()
+            (::aMemberProperty).let { it() }
+            (::aExtensionProperty).let { it() }
 
-            (::memberFunction)()
-            (::memberProperty)()
+            (::memberFunction).let { it() }
+            (::memberProperty).let { it() }
 
-            (::bExtensionFunction)()
-            (::bExtensionProperty)()
+            (::bExtensionFunction).let { it() }
+            (::bExtensionProperty).let { it() }
 
             return result
         }
@@ -53,28 +53,28 @@ fun box(): String {
 
     result = ""
     with(A()) {
-        (::memberFunction)()
-        (::aExtensionFunction)()
+        (::memberFunction).let { it() }
+        (::aExtensionFunction).let { it() }
 
-        (::memberProperty)()
-        (::aExtensionProperty)()
+        (::memberProperty).let { it() }
+        (::aExtensionProperty).let { it() }
     }
     if (result != "A.mf,A.ef,A.mp,A.ep,") return "Fail $result"
 
     result = ""
     with(A()) {
         with(B()) {
-            (::aMemberFunction)()
-            (::aExtensionFunction)()
+            (::aMemberFunction).let { it() }
+            (::aExtensionFunction).let { it() }
 
-            (::aMemberProperty)()
-            (::aExtensionProperty)()
+            (::aMemberProperty).let { it() }
+            (::aExtensionProperty).let { it() }
 
-            (::memberFunction)()
-            (::memberProperty)()
+            (::memberFunction).let { it() }
+            (::memberProperty).let { it() }
 
-            (::bExtensionFunction)()
-            (::bExtensionProperty)()
+            (::bExtensionFunction).let { it() }
+            (::bExtensionProperty).let { it() }
         }
     }
     if (result != "A.amf,A.ef,A.amp,A.ep,B.mf,B.mp,B.ef,B.ep,") return "Fail $result"

compiler/testData/codegen/box/callableReference/bound/genericValOnLHS.kt

@@ -7,6 +7,6 @@ class Host {
 
 fun box(): String {
     Generic(Host()).p::class
-    (Generic(Host()).p::t)()
-    return (Generic(Host()).p::v)()
+    (Generic(Host()).p::t).let { it() }
+    return (Generic(Host()).p::v).let { it() }
 }

compiler/testData/codegen/box/callableReference/bound/kt15446.kt

@@ -3,13 +3,13 @@
 fun box(): String {
     val a = intArrayOf(1, 2)
     val b = arrayOf("OK")
-    if ((a::component2)() != 2) {
+    if ((a::component2).let { it() } != 2) {
         return "fail"
     }
 
-    if ((a::get)(1) != 2) {
+    if ((a::get).let { it(1) } != 2) {
         return "fail"
     }
 
-    return (b::get)(0)
+    return (b::get).let { it(0) }
 }

compiler/testData/codegen/box/callableReference/bound/objectReceiver.kt

@@ -3,4 +3,4 @@ object Singleton {
     fun ok() = "OK"
 }
 
-fun box() = (Singleton::ok)()
+fun box() = (Singleton::ok).let { it() }