Review request for 8058322: Zero name_index item of MethodParameters attribute cause MalformedParameterException

[Eric McCorkle]

Hello,

Please review this simple change which addresses a failure condition in
the method parameter reflection implementation.  In the initial
implementation of method parameter reflection, a parameter with a
parameter_name index of 0 denoted a parameter with no name, and the VM
translated this into the empty string when creating the Parameter object
to return to Java code.  However, towards the end of the 8 cycle, the
spec was updated to state that a zero parameter_name index should denote
a parameter with no name, and should result in Parameter.getName()
returning an empty string, whereas the empty string /constant/ is
expressly forbidden as a parameter name, and should result in
MalformedParametersException.  The reflection API was updated to reflect
this behavior, but it seems the VM still translates a parameter_name
index of 0 into the empty string.  This patch removes that, resulting in
correct behavior of the reflection API for parameters with no name.

The webrev is here:
http://cr.openjdk.java.net/~emc/8058322/

The bug is here:
https://bugs.openjdk.java.net/browse/JDK-8058322