RFR (M): Make TSAN a build-time JVM feature

[Man Cao]

Note that I moved the two new files for TSAN into the directory
"share/tsan".
Looking at our internal TSAN code, there will be more new files for TSAN to
add in the future. A separate directory seems cleaner.

-Man


On Fri, Mar 29, 2019 at 7:10 PM Man Cao <manc at google.com> wrote:

> Hi,
>
> Could I get review for this:
> http://cr.openjdk.java.net/~manc/tsan/20190329/webrev.00/
>
> It makes it possible to disable TSAN at build time, using
> "--with-jvm-features=-tsan". My initial purpose was to add a "#ifdef" macro
> for TSAN, but it seems making TSAN a JVM feature is the right way to go for
> the long term.
>
> Tested by building with and without TSAN, and running LD_PRELOAD.
>
> -Man
>