Add build reports for diagnosing build problems in Gradle

#KT-12700 Fixed

To turn build reports, add 'kotlin.build.report.enable=true' to
gradle.properties file
(or pass it in CLI via`-Pkotlin.build.report.enable=true`).
By default build reports are created in
`rootProject/build/reports/kotlin-build`.
Build report dir can be customized via `kotlin.build.report.dir`
property.

compiler/daemon/daemon-common/src/org/jetbrains/kotlin/daemon/common/CompilationResults.kt

@@ -26,5 +26,6 @@ interface CompilationResults : Remote {
 }
 
 enum class CompilationResultCategory(val code: Int) {
-    IC_COMPILE_ITERATION(0)
+    IC_COMPILE_ITERATION(0),
+    IC_LOG(1)
 }