[mlir] Handle the newly-added "Reserved" FramePointerKind for 1a52392 (NFC)

/llvm-project/mlir/lib/Target/LLVMIR/ModuleImport.cpp:48:
tools/mlir/include/mlir/Dialect/LLVMIR/LLVMConversionEnumsFromLLVM.inc:158:11:
error: enumeration value 'Reserved' not handled in switch [-Werror,-Wswitch]
  switch (value) {
          ^~~~~
1 error generated.

Author: DamonFool

mlir/include/mlir/Dialect/LLVMIR/LLVMEnums.td

@@ -716,12 +716,15 @@ def FramePointerKindNonLeaf
     : LLVM_EnumAttrCase<"NonLeaf", "non-leaf", "NonLeaf", 1>;
 def FramePointerKindAll
     : LLVM_EnumAttrCase<"All", "all", "All", 2>;
+def FramePointerKindReserved
+    : LLVM_EnumAttrCase<"Reserved", "reserved", "Reserved", 3>;
 
 def FramePointerKindEnum : LLVM_EnumAttr<
     "FramePointerKind",
     "::llvm::FramePointerKind",
     "LLVM FramePointerKind",
-    [FramePointerKindNone, FramePointerKindNonLeaf, FramePointerKindAll]> {
+    [FramePointerKindNone, FramePointerKindNonLeaf,
+     FramePointerKindAll, FramePointerKindReserved]> {
   let cppNamespace = "::mlir::LLVM::framePointerKind";
 }