[llvm] [GlobalISel] Encode root operand indices in match opcodes (PR #210562)

[Pierre van Houtryve via llvm-commits]

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@@ -597,6 +627,8 @@ enum {
   /// Keeping track of the number of the GI opcodes. Must be the last entry.
   GIU_NumOpcodes,
 };
+static_assert(GIU_NumOpcodes <= 256,
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Pierre-vh wrote:

How many opcodes do we have now ? I am worried this is accelerating us towards running out of them.

https://github.com/llvm/llvm-project/pull/210562