llvm: disable assertions by default
llvm: disable assertions by default

This makes the build consistent with std_cmake_args, which passes
-DNDEBUG. Before this both -DNDEBUG and -DLLVM_ENABLE_ASSERTIONS=On
were passed.

Closes #48211.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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