8038615: test262 repo is now a git repo in github

Reviewed-by: lagergren, hannesw

nashorn/README

@@ -81,13 +81,13 @@ TestNG library and placing its jar file into the lib subdirectory:
     
 After that, you can run the tests using:
     cd make
-    ant test
+    ant clean test
     
 You can also run the ECMA-262 test suite with Nashorn. In order to do
 that, you will need to get a copy of it and put it in
 test/script/external/test262 directory. A convenient way to do it is:
 
-   hg clone http://hg.ecmascript.org/tests/test262/ test/script/external/test262
+   git clone https://github.com/tc39/test262 test/script/external/test262
     
 Alternatively, you can check it out elsewhere and make
 test/script/external/test262 a symbolic link to that directory. After
@@ -95,6 +95,11 @@ you've done this, you can run the ECMA-262 tests using:
 
     cd nashorn~jdk8/nashorn/make
     ant test262
+
+Ant target to get/update external test suites:
+
+    ant externals
+    ant update-externals
     
 These tests take time, so we have a parallelized runner for them that
 takes advantage of all processor cores on the computer:

nashorn/make/build.xml

@@ -42,6 +42,9 @@
     <condition property="hg.executable" value="/usr/local/bin/hg" else="hg">
       <available file="/usr/local/bin/hg"/>
     </condition>
+    <condition property="git.executable" value="/usr/local/bin/git" else="git">
+      <available file="/usr/local/bin/git"/>
+    </condition>
     <!-- check if JDK already has ASM classes -->
     <available property="asm.available" classname="jdk.internal.org.objectweb.asm.Type"/>
     <!-- check if testng.jar is avaiable -->
@@ -503,18 +506,17 @@ grant codeBase "file:/${basedir}/test/script/markdown.js" {
 
   <!-- test262 test suite -->
   <target name="get-test262" depends="init" unless="${test-sys-prop.external.test262}">
-    <!-- clone test262 mercurial repo -->
-    <exec executable="${hg.executable}">
+    <!-- clone test262 git repo -->
+    <exec executable="${git.executable}">
        <arg value="clone"/>
-       <arg value="http://hg.ecmascript.org/tests/test262"/>
+       <arg value="https://github.com/tc39/test262"/>
        <arg value="${test.external.dir}/test262"/>
     </exec>
   </target>
   <target name="update-test262" depends="init" if="${test-sys-prop.external.test262}">
-    <!-- update test262 mercurial repo -->
-    <exec executable="${hg.executable}" dir="${test.external.dir}/test262">
+    <!-- update test262 git repo -->
+    <exec executable="${git.executable}" dir="${test.external.dir}/test262">
        <arg value="pull"/>
-       <arg value="-u"/>
     </exec>
   </target>