[MLIR][CAPI] Move `DenseMapInfo<MlirTypeID>`

[makslevental]

Summary

I mistakenly put this in mlir/CAPI/Support.h at some point during the flurry of refactoring of TypeCasters but as @jpienaar rightly pointed out, it doesn't belong there.

[makslevental]

move to PyBindUtils.h

mlir/include/mlir/CAPI/Support.h

 
 inline mlir::LogicalResult unwrap(MlirLogicalResult res) {
   return mlir::success(mlirLogicalResultIsSuccess(res));
 }
 
 DEFINE_C_API_METHODS(MlirTypeID, mlir::TypeID)
 DEFINE_C_API_PTR_METHODS(MlirTypeIDAllocator, mlir::TypeIDAllocator)
 
-namespace llvm {
-
-template <>
-struct DenseMapInfo<MlirTypeID> {
-  static inline MlirTypeID getEmptyKey() {
-    auto *pointer = llvm::DenseMapInfo<void *>::getEmptyKey();
-    return mlirTypeIDCreate(pointer);
-  }
-  static inline MlirTypeID getTombstoneKey() {
-    auto *pointer = llvm::DenseMapInfo<void *>::getTombstoneKey();
-    return mlirTypeIDCreate(pointer);
-  }
-  static inline unsigned getHashValue(const MlirTypeID &val) {
-    return mlirTypeIDHashValue(val);
-  }
-  static inline bool isEqual(const MlirTypeID &lhs, const MlirTypeID &rhs) {
-    return mlirTypeIDEqual(lhs, rhs);
-  }
-};
-} // namespace llvm
-
 #endif // MLIR_CAPI_SUPPORT_H

mlir/lib/Bindings/Python/PybindUtils.h

 private:
   intptr_t startIndex;
   intptr_t length;
   intptr_t step;
 };
 
 } // namespace mlir
 
+namespace llvm {
+
+template <>
+struct DenseMapInfo<MlirTypeID> {
+  static inline MlirTypeID getEmptyKey() {
+    auto *pointer = llvm::DenseMapInfo<void *>::getEmptyKey();
+    return mlirTypeIDCreate(pointer);
+  }
+  static inline MlirTypeID getTombstoneKey() {
+    auto *pointer = llvm::DenseMapInfo<void *>::getTombstoneKey();
+    return mlirTypeIDCreate(pointer);
+  }
+  static inline unsigned getHashValue(const MlirTypeID &val) {
+    return mlirTypeIDHashValue(val);
+  }
+  static inline bool isEqual(const MlirTypeID &lhs, const MlirTypeID &rhs) {
+    return mlirTypeIDEqual(lhs, rhs);
+  }
+};
+} // namespace llvm
+
 #endif // MLIR_BINDINGS_PYTHON_PYBINDUTILS_H