[Docs] Fix running-a-pass-with-opt in doc #79273
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In https://llvm.org/docs/WritingAnLLVMNewPMPass.html#running-a-pass-with-opt
We need to put
HelloWorld.cpp
toadd_llvm_component_library
in thellvm/lib/Transforms/Utils/CMakeLists.txt
file. This will ensure that thepass is built and linked into
opt
.Otherwise it will lead to
ld: Undefined symbols