RFR: 8344350: Add '.gdbinit' and '.lldbinit' to file '.gitignore'

[Guoxiong Li]

Hi all,

Some developers want to run some initial scripts locally when the debugger (gdb or lldb) starts. So they often add a file named `.gdbinit` or `.lldbinit` in the project root path. It is good to ignore them.

Thanks for your review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8344350

Changes: https://git.openjdk.org/jdk/pull/22176/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22176&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344350
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22176.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22176/head:pull/22176

PR: https://git.openjdk.org/jdk/pull/22176