RFR(XS): 8155163 - JVMCI: MethodHandleAccessProvider.resolveInvokeBasicTarget implementation doesn't match javadoc

[Dmitrij Pochepko]

Hi,

please review fix for JDK-8155163 - JVMCI: 
MethodHandleAccessProvider.resolveInvokeBasicTarget implementation 
doesn't match javadoc

MethodHandleAccessProvider.resolveInvokeBasicTarget implementation 
throws NPE in case 1st parameter doesn't represent MethodHandle, but 
according to javadoc it should return null in such case. So, a small fix 
should be applied to match javadoc.

CR: https://bugs.openjdk.java.net/browse/JDK-8155163
Webrev: http://cr.openjdk.java.net/~dpochepk/8155163/webrev.01/

I've tested this change on linux_x64 via jprt.

Thanks,
Dmitrij
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