Intrinsics for 'reversed': infrastructure & primitive range support

#KT-21323 In Progress

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedEmptyRangeLiteral.kt

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+
+fun box(): String {
+    for (i in (4 .. 1).reversed()) {
+        throw AssertionError("Loop should not be executed")
+    }
+    for (i in (4L .. 1L).reversed()) {
+        throw AssertionError("Loop should not be executed")
+    }
+    for (i in ('D' .. 'A').reversed()) {
+        throw AssertionError("Loop should not be executed")
+    }
+    return "OK"
+}
+
+// 0 reversed
+// 0 getFirst
+// 0 getLast
+// 0 getStep

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedRangeLiteral.kt

@@ -0,0 +1,29 @@
+// WITH_RUNTIME
+import kotlin.test.*
+
+fun box(): String {
+    var sum = 0
+    for (i in (1 .. 4).reversed()) {
+        sum = sum * 10 + i
+    }
+    assertEquals(4321, sum)
+
+    var sumL = 0L
+    for (i in (1L .. 4L).reversed()) {
+        sumL = sumL * 10 + i
+    }
+    assertEquals(4321L, sumL)
+
+    var sumC = 0
+    for (i in ('1' .. '4').reversed()) {
+        sumC = sumC * 10 + i.toInt() - '0'.toInt()
+    }
+    assertEquals(4321, sumC)
+
+    return "OK"
+}
+
+// 0 reversed
+// 0 getFirst
+// 0 getLast
+// 0 getStep