Migrate to upstream debug abstractions

[mkroening]

Closes #352.

[mkroening]

bors r+

[codecov]

Codecov Report

Merging #354 (dd578be) into master (61bc131) will increase coverage by 0.82%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
+ Coverage   62.88%   63.70%   +0.82%     
==========================================
  Files          17       16       -1     
  Lines        2465     2331     -134     
==========================================
- Hits         1550     1485      -65     
+ Misses        915      846      -69     

Impacted Files	Coverage Δ
src/arch/x86_64/registers/debug.rs	91.00% <ø> (ø)
src/linux/gdb/mod.rs	88.88% <ø> (ø)

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[bors]

Build succeeded:

• Check (aarch64, macos-latest)
• Check (x86_64, macos-latest)
• Check (x86_64, ubuntu-latest)
• Clippy (aarch64, macos-latest)
• Clippy test-kernels
• Clippy (x86_64, macos-latest)
• Clippy (x86_64, ubuntu-latest)
• Coverage
• Format
• Integration Tests
• rusty_demo
• Test (macos-latest)
• Test (ubuntu-latest)