[Dependency Scanning] Avoid configuration (and reset) of LLVM Options by the scanner #75146
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The scanning action does not have any need for handling
-llvm
options, since it will never perform any code-gen. LLVM option processing relies on global option parsing structures, and the scanner has needed to carefully attempt to synchronize access to them. This change guards the configuration of LLVM options to not happen at all for dependency scanning actions, and removes calls tollvm::cl::ResetAllOptionOccurrences()
that were previously needed.Resolves rdar://120754696