[request for review] 4877954: RFE: Special syntax for core interfaces

[Dmytro Sheyko]

Hi,

I've made some changes to patch:

1. big*Type in Symtab were removed and Lower.visitBinary() was rewritten 
using Types.unboxedType() (as Remi Forax suggested)

2. 'genuine comparable method' is choosen rather than its bridge 
(Lower.visitBinary).

3. bug fixed: following code was mistakenly rejected by compiler:

   static <B, A extends Comparable<? super B>> boolean lt1(A a, B b) {
      return a < b;
   }

I have attached new svn diff and jtreg tests I used. 
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