[opt] Pin region viewer passes to legacy PM.

[Meinersbur]

Summary

The RegionPrinter, RegionOnlyPrinter, RegionViewer and RegionOnlyViewer passes have not yet been ported to the new pass manager.

[aeubanks]

could we port these?

llvm/tools/opt/opt.cpp

std::vector<StringRef> PassNameExact = {
       "hardware-loops",       "type-promotion",
       "mve-tail-predication", "interleaved-access",
       "global-merge",         "pre-isel-intrinsic-lowering",
       "expand-reductions",    "indirectbr-expand",
       "generic-to-nvvm",      "expandmemcmp",
       "loop-reduce",          "lower-amx-type",
       "pre-amx-config",       "lower-amx-intrinsics",
       "polyhedral-info",      "replace-with-veclib",
-      "jmc-instrument"};
+      "jmc-instrument",       "dot-regions",
+      "dot-regions-only",     "view-regions",
+      "view-regions-only"};
   for (const auto &P : PassNamePrefix)
     if (Pass.startswith(P))
       return true;
   for (const auto &P : PassNameContain)
     if (Pass.contains(P))
       return true;
   return llvm::is_contained(PassNameExact, Pass);
 }