Compiler-rt is part of release clang?

Runtimes CompilerRT
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1

Is compiler-rt is part of release clang?
while building the project with clang+llvm-15.0.6-armv7a-linux-gnueabihf, seeing below error, for different symbols:
ld.lld: error: undefined symbol: __aeabi_llsr
ld.lld: error: undefined symbol: __aeabi_uldivmod
…
To fix above errors, do I need to prepare compiler-rt and link with downloaded clang?
or is there a way to avoid it.