Refactoring of CompileTimeConstant, introduce flag to represent a constant being referenced by a variable

compiler/testData/evaluate/usesVariableAsConstant/NamedConstants.kt

@@ -0,0 +1,11 @@
+package test
+
+val x = 1
+val y = "a"
+
+// val prop1: true
+val prop1 = x
+
+// val prop2: true
+val prop2 = y
+

compiler/testData/evaluate/usesVariableAsConstant/OtherTypes.kt

@@ -0,0 +1,16 @@
+package test
+
+enum class MyEnum { A;B }
+
+fun foo(): Boolean = true
+
+val x = 1
+
+// val prop1: null
+val prop1 = MyEnum.A
+
+// val prop2: null
+val prop2 = foo()
+
+// val prop3: true
+val prop3 = "$x"

compiler/testData/evaluate/usesVariableAsConstant/binaryTypes.kt

@@ -0,0 +1,29 @@
+package test
+
+val x = 1
+val y = true
+
+// val prop1: false
+val prop1 = 1 > 2 
+
+// val prop2: false
+val prop2 = 2 + 3 
+
+// val prop3: true
+val prop3 = 2 + x
+
+// val prop4: true
+val prop4 = x < 2
+
+// val prop5: true
+val prop5 = y && true
+
+// val prop6: false
+val prop6 = true && false || 2 > 1
+
+// val prop7: true
+val prop7 = x == 1
+
+// val prop8: true
+val prop8 = 1 / x
+

compiler/testData/evaluate/usesVariableAsConstant/simpleTypes.kt

@@ -0,0 +1,23 @@
+package test
+
+// val prop1: false
+val prop1 = 1
+
+// val prop2: false
+val prop2 = "hello"
+
+// val prop3: false
+val prop3 = true
+
+// val prop4: false
+val prop4 = false
+
+// val prop5: false
+val prop5 = -7453
+
+// val prop6: false
+val prop6 = 3.56
+
+// val prop7: false
+val prop7 = 5464564L
+