JVM_IR optimize temporary vals initialized with other vals

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallChainMemberExt2.kt

@@ -0,0 +1,18 @@
+import Host.b
+import Host.c
+import Host.s
+
+class A
+class B
+class C
+
+object Host {
+    val A.b: B get() = B()
+    val B.c: C get() = C()
+    val C.s: String get() = "s"
+}
+
+fun test(an: A?) = an?.b?.c?.s
+
+// JVM_IR_TEMPLATES
+// 0 ASTORE