[clang] [CIR] Upstream initial support for fixed size VectorType (PR #136488)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -307,6 +307,26 @@ def CIR_ArrayType : CIR_Type<"Array", "array",
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// VectorType (fixed size)
+//===----------------------------------------------------------------------===//
+
+def CIR_VectorType : CIR_Type<"Vector", "vector",
+    [DeclareTypeInterfaceMethods<DataLayoutTypeInterface>]> {
+
+  let summary = "CIR vector type";
+  let description = [{
+    `cir.vector' represents fixed-size vector types.  The parameters are the
+    element type and the number of elements.
+  }];
+
+  let parameters = (ins "mlir::Type":$eltType, "uint64_t":$size);
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bcardosolopes wrote:

Since @xlauko is doing a lot of work on making things nice and consistency, I'm all in for his suggestions. Also probably worth encoding in https://llvm.github.io/clangir/Dialect/cir-style-guide.html so we can point people to it.

https://github.com/llvm/llvm-project/pull/136488