Move builtins generators to their own source set

Make them depend on bootstrap stdlib.
This is to prevent recompiling the entire project when we need just to
generate builtins sources.

generators/builtins/common.kt

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.generators.builtins
+
+import org.jetbrains.kotlin.generators.builtins.ProgressionKind.*
+import kotlin.properties.Delegates
+
+enum class PrimitiveType {
+    BYTE,
+    CHAR,
+    SHORT,
+    INT,
+    LONG,
+    FLOAT,
+    DOUBLE,
+    BOOLEAN;
+
+    val capitalized: String get() = name.toLowerCase().capitalize()
+    companion object {
+        val exceptBoolean = PrimitiveType.values().filterNot { it == BOOLEAN }
+        val onlyNumeric = PrimitiveType.values().filterNot { it == BOOLEAN || it == CHAR }
+    }
+}
+
+enum class ProgressionKind {
+    CHAR,
+    INT,
+    LONG;
+
+    val capitalized: String get() = name.toLowerCase().capitalize()
+}
+
+fun progressionIncrementType(kind: ProgressionKind) = when (kind) {
+    CHAR -> "Int"
+    else -> kind.capitalized
+}
+
+fun areEqualNumbers(v: String) = "$v == other.$v"
+
+fun hashLong(v: String) = "($v xor ($v ushr 32))"
+