Integrated: 7903620: jasm: the tool fails if the class name of an inner class is this_class or super_class

[Leonid Kuskov]

This is the trivial fix for the [7903620](https://bugs.openjdk.org/browse/CODETOOLS-7903620) file : JasmTokens.java<br>
Also, control has been added for the Source Attribute that could wrongly refer to CP.

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Commit messages:
 - 7903620: jasm: the tool fails if the class name of an inner class is this_class or super_class

Changes: https://git.openjdk.org/asmtools/pull/71/files
 Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=71&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903620
  Stats: 15 lines in 4 files changed: 6 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/asmtools/pull/71.diff
  Fetch: git fetch https://git.openjdk.org/asmtools.git pull/71/head:pull/71

PR: https://git.openjdk.org/asmtools/pull/71