Add DebugServiceGTest.cpp (TraceRingBuffer, DebugSignalInfo, BreakOp
regression coverage for the HI-4/HI-9 fixes) to Test/GTest's OBJSX so it
builds and runs as part of ./Build/x86-linux/GTest/MainGTest.ex alongside
the rest of the unit suite. 17/17 tests pass.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>