RFR: 8303068: Memory leak in DwarfFile::LineNumberProgram::run_line_number_program

[David Holmes]

After allocating:

_state = new (std::nothrow) LineNumberProgramState(_header);

we need to `delete _state` before returning.

Testing: tiers 1-3

Thanks.

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Commit messages:
 - 8303068: Memory leak in DwarfFile::LineNumberProgram::run_line_number_program

Changes: https://git.openjdk.org/jdk/pull/12738/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12738&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303068
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12738.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12738/head:pull/12738

PR: https://git.openjdk.org/jdk/pull/12738