RFR: JDK-8216021: RunTest.gmk might set concurrency level to 1 on Windows

[Christian Tornqvist]

Looks good, thanks for fixing this!

Thanks,
Christian

> On Jan 3, 2019, at 2:30 AM, Erik Joelsson <erik.joelsson at oracle.com> wrote:
> 
> When running tests using "make run-test-prebuilt" on Windows, the calculation of available memory may fail. This only happens on certain systems, and is likely related to which version of Cygwin that is being used. The consequence is that concurrency gets set to 1. The cause of the problem is mishandling of Windows \r line endings, which Cygwin tools are known to handle differently in different versions.
> 
> To fix the problem here, I've added explicit filtering of \r before trying to interpret the memory size as a number.
> 
> I checked the corresponding construct in configure, and it seems to work on the same machine where RunTestsPrebuilt.gmk failed, so I left it alone.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8216021
> 
> Webrev: http://cr.openjdk.java.net/~erikj/8216021/webrev.01/
> 
> /Erik
>