pub fn is_system_llvm(
target_config: &HashMap<TargetSelection, Target>,
llvm_from_ci: bool,
host_target: TargetSelection,
target: TargetSelection,
) -> boolExpand description
Returns true if this is an external version of LLVM not managed by bootstrap.
In particular, we expect llvm sources to be available when this is false.
NOTE: this is not the same as !is_rust_llvm when llvm_has_patches is set.