Improve debuginfo test coverage for simple statics.

- Re-enabled basic-types-globals which has been disabled since 2018
- Updated its now-rotted assertions about GDB's output to pass
- Rewrote header comment describing some previous state of GDB behavior
  that didn't match either the checked-in assertions _or_ the current
  behavior, and so I assume has just been wrong for some time.
- Copy-pasta'd the test into a version that uses LTO to check for
  regression on #90357, because I don't see a way to matrix the same
  test into several build configurations.

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