[15] RFR(XS) 8248597: [Graal] api/java_security/SignatureSpi/DelegationTests.html fails with Method "javasoft.sqe.tests.api.java.security.SignatureSpi.JCKSignatureSpi.clear" doesn't exist.

[Dean Long]

https://bugs.openjdk.java.net/browse/JDK-8248597
http://cr.openjdk.java.net/~dlong/8248597/webrev/

This change fixes an issue with frame states in Graal that was causing a 
JCK test to fail.  The fix is from Tom Rodriguez.  This change has 
already been reviewed and merged into Graal.  A new unit test was added 
to detect the problem.  After this is reviewed I'll be requesting 
permission to push this into 15.

dl