[llvm] [CodeGen] Stop exporting cl::opts. NFC (PR #228728)

[Reid Kleckner via llvm-commits]

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@@ -224,6 +224,11 @@ LiveInterval *LiveIntervals::createInterval(Register reg) {
   return new LiveInterval(reg, Weight);
 }
 
+LiveRange *LiveIntervals::createRegUnitRange() {
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rnk wrote:

Do we need this wrapper? Old code seemed fine.

https://github.com/llvm/llvm-project/pull/228728