RFR: 8303068: Memory leak in DwarfFile::LineNumberProgram::run_line_number_program [v2]

[David Holmes]

> After allocating:
> 
> _state = new (std::nothrow) LineNumberProgramState(_header);
> 
> we need to `delete _state` before returning.
> 
> Testing: tiers 1-3
> 
> Thanks.

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Simpler, cleaner and more robust fix

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/12738/files
  - new: https://git.openjdk.org/jdk/pull/12738/files/3040fab4..e213ad56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12738&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12738&range=00-01

  Stats: 5 lines in 2 files changed: 2 ins; 3 del; 0 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