libclang-rt-15-dev 1:15.0.7-4ubuntu1 (riscv64 binary) in ubuntu mantic

 This package provides various libraries:
 .
   * builtins - Simple libraries that provide implementation of the
     low-level target-specific hooks required by code generation
     and other runtime components.
   * sanitizer runtimes - AddressSanitizer, ThreadSanitizer,
     UndefinedBehaviorSanitizer, MemorySanitizer, LeakSanitizer
     DataFlowSanitizer, etc
   * profile - Library which is used to collect coverage information.