Vendor starlark code from github.com/bazelbuild/bazel master branch

Included changes:

  - b08585cea8e6451d16d584ace1bafee882d88378 Eliminate all hardcoded usage of the type universe in `Mo... by brandjon <brandjon@google.com>
  - ed98d31d352a41595d9f4561fae501bd67a43826 Add ability for builtin methods to act as types by brandjon <brandjon@google.com>
  - 32eef3485d66f448df4b66fe4f0d530e1a88f99b Eliminate redundant constructor param by brandjon <brandjon@google.com>
  - b11068b3da3dfce20150a5365cc22d2553d3b372 Fix support for File objects in proto.encode_text by arostovtsev <arostovtsev@google.com>
  - b5f2b3440316106f8b770ecdc210d0c7e8409278 Rename `StarlarkClassDescriptor` -> `ClassDescriptor` by brandjon <brandjon@google.com>
  - 5a99b45299038d23646b0829854082fe707c9898 Encode NativeInfo via a proxy Structure to avoid dep from... by arostovtsev <arostovtsev@google.com>
  - 8bd966e6900e0da20854da6d4cee43c151296ec8 Update comments in `CallUtils` machinery by brandjon <brandjon@google.com>
  - 9bcfa7e87f1354a15f303e754347bbc6541ddc5b Add machinery for registering a Starlark value as a type ... by brandjon <brandjon@google.com>
  - 9fcee3ebaa1cfd59ae3ddce571788ad8410c7ff0 Type checker: Add call and conditional expression support by arostovtsev <arostovtsev@google.com>
  - 8f3d629275742087b262a96f56af4e16cdf9c231 Remove the version of `StarlarkValue#repr` that doesn't t... by wyv <wyv@google.com>

VENDOR_STARLARK_REV_ID: b08585cea8e6451d16d584ace1bafee882d88378
Change-Id: I96ada2d54c4df85f7acc908959bcfe133ad43c38

Author: Bazel Contributor

third_party/bazel/main/java/com/google/devtools/build/lib/packages/BUILD

@@ -8,7 +8,7 @@ filegroup(
         "BUILD",
         "//third_party/bazel/main/java/net/starlark/java/annot:srcs",
         "//third_party/bazel/main/java/net/starlark/java/eval:srcs",
-        "//third_party/bazel/main/java/net/starlark/java/lib/json:srcs",
+        "//third_party/bazel/main/java/net/starlark/java/lib:srcs",
         "//third_party/bazel/main/java/net/starlark/java/spelling:srcs",
         "//third_party/bazel/main/java/net/starlark/java/syntax:srcs",
     ],

third_party/bazel/main/java/com/google/devtools/build/lib/packages/Info.java

@@ -190,6 +190,29 @@
    */
   boolean useStarlarkSemantics() default false;
 
+  /**
+   * Whether this method can act as a type in a type expression.
+   *
+   * <p>An example would be the {@code list} builtin symbol.
+   *
+   * <p>If true, the class identified by the Java method's return type is taken to be the Java class
+   * whose instances are Starlark values of this Starlark type. For example, {@code list()} is
+   * implemented by {@link MethodLibrary#list}, whose return type is {@link StarlarkList}, and
+   * instances of {@code StarlarkList} are Starlark values of the {@code list} type.
+   *
+   * <p>The return type's class must define a static method with the signature:
+   *
+   * <pre>
+   *     public static TypeConstructor getBaseTypeConstructor() {...}
+   * </pre>
+   *
+   * which is reflectively invoked to obtain an appropriate base type constructor (e.g. {@link
+   * Types#LIST_CONSTRUCTOR}). The builtin processing machinery will wrap this base type constructor
+   * with generated type information for the class's various {@code @StarlarkMethod}s (such as
+   * {@code list.append}).
+   */
+  boolean isTypeConstructor() default false;
+
   /**
    * If non-empty, the annotated method will only be callable if the given semantic flag is true.
    * Note that at most one of {@link #enableOnlyWithFlag} and {@link #disableWithFlag} can be