Java 8 (and 9) support

[mtake]

Main changes

• Updated the minimum Java version to 8. Java backend will generate class files in Java 8 format by default.
• Java lambda expressions can be converted from/to X10 closures. See Java8.x10 and java.interop example for the usage.
• Java interface method body (either static or default method) can be called from X10. See java.interop example for the usage.
• Updated X10 class resolver to look up Java classes from Java archives (jar files) as well as Java modules. This is required to run X10 on Java 9.

Other miscellaneous changes

• Removed WALA. SMAP information is no longer available.
• Updated dependencies to the current ones.
• Fixed a pre-existing bug in Java backend for overriding Java method with return type T in X10.
• Fixed a pre-existing bug in X10 serializer for serializing plain (i.e. non-X10 generated) Java classes with writeReplace/readResolve methods. This is required to serialize dynamic classes such as Java lambda in X10.

[saraswat]

Awesome work!

On Feb 13, 2018, at 9:27 AM, David Grove notifications@github.com wrote:

@dgrove-oss approved this pull request.

LGTM. Thanks for doing this.

I'll take a look at the X10DT side of this update after you merge this.

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