CodeGen: avoid use of @clang.arc.use intrinsic at O0
The clang.arc.use intrinsic is removed via the ARC Contract Pass. This pass is only executed in optimized builds (>= opt level 1). Prevent the optimization implemented in SVN r301667 from triggering at optimization level 0 like every other ARC use intrinsic usage. llvm-svn: 302270
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