Checking for constants values in incremental compiler.

jps-plugin/testData/incremental/constantUnchanged/build.log

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+Cleaning output files:
+out/production/module/test/TestPackage-const-*.class
+out/production/module/test/TestPackage.class
+End of files
+Compiling files:
+src/const.kt
+End of files

jps-plugin/testData/incremental/constantUnchanged/const.kt

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+package test
+
+val CONST = "foo"

jps-plugin/testData/incremental/constantUnchanged/const.kt.new

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+package test
+
+val CONST = "foo"

jps-plugin/testData/incremental/constantUnchanged/usage.kt

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+package test
+
+deprecated(CONST + CONST)
+class Usage