Make suspension calls generation more stable

Instead of performing signature change during transformation
it's convinient to make just when generating corresponding call,
for example there is no need to think about default parameters as they just work as is

See comment above replaceSuspensionFunctionViewWithRealDescriptor for clarification

compiler/testData/codegen/box/coroutines/defaultParametersInSuspend.kt

@@ -0,0 +1,41 @@
+class Controller {
+    suspend fun suspendHere(a: String = "abc", i: Int = 2, x: Continuation<String>) {
+        x.resume(a + "#" + (i + 1))
+    }
+}
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>) {
+    c(Controller()).resume(Unit)
+}
+
+fun box(): String {
+    var result = "OK"
+
+    builder {
+        var a = suspendHere()
+        if (a != "abc#3") {
+            result = "fail 1: $a"
+            throw RuntimeException(result)
+        }
+
+        a = suspendHere("cde")
+        if (a != "cde#3") {
+            result = "fail 2: $a"
+            throw RuntimeException(result)
+        }
+
+        a = suspendHere(i = 6)
+        if (a != "abc#7") {
+            result = "fail 3: $a"
+            throw RuntimeException(result)
+        }
+
+        a = suspendHere("xyz", 9)
+        if (a != "xyz#10") {
+            result = "fail 4: $a"
+            throw RuntimeException(result)
+        }
+    }
+
+    return result
+}