Patch for review: java.lang.Class - signers issue

[Andrew Haley]

Michael Koch writes:
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 > 
 > I wrote the attached two patches to make it possible to compile 
 > classpath with gcj again. I see these patches as start for a 
 > discussion of this problem. These patches fix PR/12768 which is a 
 > regression from 3.3.

Tom wanted to call the field hack_signers.  I don't know why.  I would
have thought _Jv_signers a better choice.  However, this should be
good enough for 3.4.

Andrew.