Add 'asSequence' operation support

idea/idea-jvm/src/com/intellij/debugger/streams/kotlin/lib/sequence/KotlinSequencesSupport.kt

@@ -16,7 +16,7 @@ import com.intellij.debugger.streams.trace.impl.handler.unified.DistinctTraceHan
 class KotlinSequencesSupport : LibrarySupportBase() {
   init {
     addIntermediateOperationsSupport(*filterOperations("filter", "filterNot", "filterIndexed",
-        "filterIsInstance", "drop", "dropWhile", "minus", "minusElement", "take", "takeWhile", "onEach"))
+        "filterIsInstance", "drop", "dropWhile", "minus", "minusElement", "take", "takeWhile", "onEach", "asSequence"))
 
     addIntermediateOperationsSupport(*mapOperations("map", "mapIndexed", "requireNoNulls", "withIndex",
         "zip", "constrainOnce"))

idea/testData/debugger/sequence/exec/sequence/outs/asSequence.out

@@ -0,0 +1,32 @@
+LineBreakpoint created at AsSequence.kt:5
+Run Java
+Connected to the target VM
+AsSequence.kt:5
+sequenceOf(1, 2, 3)
+.asSequence()
+.count()
+asSequence
+    before: 1,3,5
+    after: 2,4,6
+count
+    before: 2,4,6
+    after: nothing
+mappings for asSequence
+  direct:
+    1 -> 2
+    3 -> 4
+    5 -> 6
+  reverse:
+    1 <- 2
+    3 <- 4
+    5 <- 6
+mappings for count
+  direct:
+    2 -> nothing
+    4 -> nothing
+    6 -> nothing
+  reverse:
+    empty
+Disconnected from the target VM
+
+Process finished with exit code 0

idea/testData/debugger/sequence/exec/sequence/src/misc/AsSequence.kt

@@ -0,0 +1,6 @@
+package misc
+
+fun main(args: Array<String>) {
+  // Breakpoint!
+  sequenceOf(1, 2, 3).asSequence().count()
+}

idea/tests/com/intellij/debugger/streams/kotlin/exec/sequence/MiscOperationsTest.kt

@@ -25,4 +25,6 @@ class MiscOperationsTest : OperationsTestCase("misc") {
   fun testWindowedWithPartial() = doTestWithResult()
   fun testWindowedWithBigStep() = doTestWithResult()
   fun testWindowedWithStep() = doTestWithResult()
+
+  fun testAsSequence() = doTestWithResult()
 }

idea/tests/com/intellij/debugger/streams/kotlin/exec/sequence/OperationsTestCase.kt

@@ -9,8 +9,8 @@ abstract class OperationsTestCase(private val packageName: String) : KotlinTrace
     override val appName: String = "sequence"
     override val librarySupport: LibrarySupportProvider = KotlinSequenceSupportProvider()
 
-    fun doTestWithResult() = doTest(false, fullyQualifiedClassName())
-    fun doTestWithoutResult() = doTest(true, fullyQualifiedClassName())
+    protected fun doTestWithResult() = doTest(false, fullyQualifiedClassName())
+    protected fun doTestWithoutResult() = doTest(true, fullyQualifiedClassName())
 
     private fun fullyQualifiedClassName() = "$packageName.${getTestName(false)}"
 }