RFR: JDK-8189429: SA: MacOSX: Replace the deprecated PT_ATTACH with PT_ATTACHEXC

[Jini George]

Hi all,

[Including build-dev also since this includes build related changes].

Requesting reviews for:

https://bugs.openjdk.java.net/browse/JDK-8189429 (SA: MacOSX: Replace 
the deprecated PT_ATTACH with PT_ATTACHEXC)

Webrev: http://cr.openjdk.java.net/~jgeorge/8189429/webrev.04/

This is the follow-up solution for the temporary restoration of 
PT_ATTACH to fix https://bugs.openjdk.java.net/browse/JDK-8184042 
(several serviceability/sa tests timed out on MacOS X), which was done 
in Oct 2017. The mails related to this are at:

http://mail.openjdk.java.net/pipermail/serviceability-dev/2017-August/021702.html

Changes as compared to the patch sent last year 
(http://cr.openjdk.java.net/~jgeorge/8184042/webrev.00/):

* Addressed the review comments which were provided by Poonam, Dan, Dmitry.
* A major change as compared to what was done last year is that the MIG 
generated files have been included as a part of the JDK build process.
* The test case which was provided in the patch last year is no longer 
required since we have ClhsdbAttach.java testing the same functionality 
as a part of the SA testsuite now.
* Other than that, some minor improvements have been done wrt error 
handling.

The steps for the proposed solution have been provided in JBS.

Testing: ALL the SA tests pass on MacOSX and the other Mach5 platforms.

Thanks to Sharath, Robin, Gerard and Dan for looking into the changes 
and providing valuable comments.

Thanks,
Jini.