[llvm] [GlobalISel] Support physical register inputs in nested patterns (PR #121239)

[Sergei Barannikov via llvm-commits]

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@@ -492,9 +493,11 @@ class RuleMatcher : public Matcher {
   /// the renderers.
   StringMap<OperandMatcher *> DefinedOperands;
 
+  using PhysRegOperandsTy = MapVector<const Record *, OperandMatcher *>;
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s-barannikov wrote:

---
Probably not a big deal:
```suggestion
  using PhysRegOperandsTy = SmallMapVector<const Record *, OperandMatcher *, 1>;
```


https://github.com/llvm/llvm-project/pull/121239