RFR(XS): 8246369: CodeCache.findBlobUnsafe(addr) sometimes asserts with valid address

[Chris Plummer]

Hello,

Please help review the following simple fix:

http://cr.openjdk.java.net/~cjplummer/8246369/webrev.00/index.html
https://bugs.openjdk.java.net/browse/JDK-8246369

Details are in the CR description.

thanks,

Chris