Kapt: Restore constant identifiers for field annotations (KT-27334)

The old behavior broke after the refactoring of annotations with use-site targets.

plugins/kapt3/kapt3-compiler/testData/converter/annotationsWithTargets.kt

@@ -0,0 +1,23 @@
+@Target(AnnotationTarget.FIELD)
+annotation class FieldAnno
+
+@Target(AnnotationTarget.PROPERTY)
+annotation class PropertyAnno
+
+@Target(AnnotationTarget.VALUE_PARAMETER)
+annotation class ParameterAnno
+
+annotation class Anno
+
+class Foo(@FieldAnno @PropertyAnno @ParameterAnno @Anno val a: String)
+
+class Bar {
+    @FieldAnno @PropertyAnno @Anno
+    val a: String = ""
+}
+
+class Baz {
+    @FieldAnno @Anno
+    @JvmField
+    val a: String = ""
+}