RFR(S): 8075253: Multiversion JAR feature: CDS does not support MV-JARs

[Calvin Cheung]

This fix was reviewed in Aug 2015[1] though most of the review comments 
was via internal mailing list. Recently, the JEP 238 (Multiple-Release 
jar files) has been checked into jdk9. So it is time to make the 
corresponding changes in hotspot.

JBS: bug: https://bugs.openjdk.java.net/browse/JDK-8075253
       (unfortunately the bug was marked as "confidential")

webrev: http://cr.openjdk.java.net/~ccheung/8075253/webrev.00/

Some adjustments need to be made due to:
- attribute name in the jar manifest has been changed to "Multi-release";
- system property has been changed to jdk.util.jar.enableMultiRelease 
and it has value of "true", "force" or "false".

The diff between this patch and the reviewed patch is as follows:

11c11
< +    const char* multi_ver = 
Arguments::get_property("jdk.util.jar.enableMultiRelease");
---
 > +    const char* multi_ver = 
Arguments::get_property("jdk.util.jar.multiversion");
14c14
< +                         strcmp(multi_ver, "true") == 0 ||
---
 > +                         strcmp(multi_ver, "enable") == 0 ||
64c64
< @@ -296,6 +345,17 @@
---
 > @@ -272,6 +321,17 @@
72c72
< +    if (strstr(buffer, "Multi-Release: true") != NULL) {
---
 > +    if (strstr(buffer, "Multiversion: true") != NULL) {

thanks,
Calvin

[1]: 
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2015-August/015589.html