KT-36956 fix back-end part in JVM and JVM_IR

PSI2IR: deparenthesize LHS expression when generating assignment
receiver.

FE: record 'set' operator call for code generation.

compiler/testData/ir/irText/expressions/kt36956.kt

@@ -0,0 +1,8 @@
+class A<T>(private val value: T) {
+    operator fun get(i: Int) = value
+    operator fun set(i: Int, v: T) {}
+}
+
+val aFloat = A<Float>(0.0f)
+
+val aInt = (aFloat[1])--