Generate static backing fields for properties in object

#KT-4973 Fixed

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/build.log

@@ -0,0 +1,14 @@
+Cleaning output files:
+out/production/module/test/Object.class
+End of files
+Compiling files:
+src/const.kt
+End of files
+Cleaning output files:
+out/production/module/test/Object.class
+out/production/module/test/Usage.class
+End of files
+Compiling files:
+src/const.kt
+src/usage.kt
+End of files

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/const.kt

@@ -0,0 +1,5 @@
+package test
+
+object Object {
+    val CONST = "old"
+}

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/const.kt.new

@@ -0,0 +1,5 @@
+package test
+
+object Object {
+    val CONST = "new"
+}

jps-plugin/testData/incremental/pureKotlin/objectConstantChanged/usage.kt

@@ -0,0 +1,4 @@
+package test
+
+deprecated(Object.CONST + Object.CONST)
+class Usage