[clang-tidy] Clang-tidy incorrectly selects the first available record in compilation_database.json without warning

[KindDragon]

Our GN produce compilation_database.json with several records for same C++ files when we compile it for several toolset, but clang-tidy always silently use first entry.

My suggestion to report error and exit when compilation_database.json contain several records for file and maybe add special argument that restore old behaviour.

For example, we can compile same file for these toolsets:

• g++
• arm-none-eabi-g++ -mthumb -mcpu=cortex-m33 -mfloat-abi=hard -mfpu=fpv5-sp-d16
• arm-none-eabi-g++ -marm -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4

[llvmbot]

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