Deprecate Double, Float and Comparable range implementations.

generators/src/org/jetbrains/kotlin/generators/builtins/progressionIterators.kt

@@ -57,11 +57,11 @@ class ${t}ProgressionIterator(start: $t, end: $t, val increment: $incrementType)
 
 fun floatingPointProgressionIterator(kind: ProgressionKind): String {
     val t = kind.capitalized
-
     return """/**
  * An iterator over a progression of values of type `$t`.
  * @property increment the number by which the value is incremented on each step.
  */
+@Deprecated("This range implementation has unclear semantics and will be removed soon.", level = DeprecationLevel.ERROR)
 class ${t}ProgressionIterator(start: $t, val end: $t, val increment: $t) : ${t}Iterator() {
     private var next = start
 

generators/src/org/jetbrains/kotlin/generators/builtins/progressions.kt

@@ -64,6 +64,11 @@ class GenerateProgressions(out: PrintWriter) : BuiltInsSourceGenerator(out) {
                 "    }"
             }
 
+            if (kind == FLOAT || kind == DOUBLE) {
+                out.println("""@Deprecated("This range implementation has unclear semantics and will be removed soon.", level = DeprecationLevel.ERROR)""")
+                out.println("""@Suppress("DEPRECATION_ERROR")""")
+            }
+
             out.println(
 """/**
  * A progression of values of type `$t`.

generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt

@@ -64,6 +64,11 @@ class GenerateRanges(out: PrintWriter) : BuiltInsSourceGenerator(out) {
 
             val toString = "\"\$start..\$end\""
 
+            if (kind == FLOAT || kind == DOUBLE) {
+                out.println("""@Deprecated("This range implementation has unclear semantics and will be removed soon.", level = DeprecationLevel.ERROR)""")
+                out.println("""@Suppress("DEPRECATION_ERROR")""")
+            }
+
             out.println(
 """/**
  * A range of values of type `$t`.