[llvm] [SelectionDAG] Optimize BSWAP yet again once more (PR #165292)

[Matt Arsenault via llvm-commits]

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@@ -142,6 +143,12 @@ static cl::opt<unsigned> ConstpoolPromotionMaxTotal(
     cl::desc("Maximum size of ALL constants to promote into a constant pool"),
     cl::init(128));
 
+static cl::opt<bool>
+    EnableOptimizeLogicalImm("arm-enable-logical-imm", cl::Hidden,
+                             cl::desc("Enable ARM logical imm instruction "
+                                      "optimization"),
+                             cl::init(true));
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arsenm wrote:

This is too specific, just don't add this? 

https://github.com/llvm/llvm-project/pull/165292