[llvm] [GlobalISel] Change MatchTable entries to 1 byte each (PR #74429)

[Wang Pengcheng via llvm-commits]

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@@ -427,8 +458,8 @@ bool GIMatchTableExecutor::executeMatchTable(
       break;
     }
     case GIM_CheckAtomicOrdering: {
-      int64_t InsnID = MatchTable[CurrentIdx++];
-      AtomicOrdering Ordering = (AtomicOrdering)MatchTable[CurrentIdx++];
+      uint64_t InsnID = nextULEB128();
+      auto Ordering = (AtomicOrdering)nextULEB128();
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wangpc-pp wrote:

Change these casting to `static_cast` by the way. :-)

https://github.com/llvm/llvm-project/pull/74429