unfortunately I couldn't write test that proves this code is wrong

(using JetJavaMirrorMaker)

... and fix test
... and remove junk code

* store PsiClass and PsiPackage inside
* do not create if there's no PsiClass or PsiPackage

between <clinit> of ErrorUtils and JetStandardClasses

used in JetTypeMapper in JetTypeMapper

* MapTypeMode contains no information not needed by JetTypeMapper
* MapTypeMode has separate VALUE and IMPL values that are needed to compile builtins

(class will be reused to find builtins)