RFR: CODETOOLS-7903334: Clean the rest of the ASM dependencies [v2]

[Alexandre Iline]

> This fix contains two changes:
>  * Completed refactoring from int access code to Modifiers interface
>  * Split instrumentation plugin in two parts: ASM-dependent  and -independent
>  
> Next step is to define a generic instrumentation interface and use it to wrap all calls into *.instrument.asm package.

Alexandre Iline has updated the pull request incrementally with one additional commit since the last revision:

  formatting

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Changes:
  - all: https://git.openjdk.org/jcov/pull/28/files
  - new: https://git.openjdk.org/jcov/pull/28/files/2544251a..ef679650

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jcov&pr=28&range=01
 - incr: https://webrevs.openjdk.org/?repo=jcov&pr=28&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jcov/pull/28.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/28/head:pull/28

PR: https://git.openjdk.org/jcov/pull/28