[Python][OM] Handle BoolAttr's before IntegerAttr's. (#7438)

BoolAttr's are IntegerAttr's, check them first.

IntegerAttr's that happen to have the characteristics of
BoolAttr will accordingly become Python boolean values.

Unclear where these come from but we do lower booleans
to MLIR bool constants so make sure to handle that.

Add test for object model IR with bool constants.

integration_test/Bindings/Python/dialects/om.py

@@ -68,6 +68,11 @@
 
       %map = om.map_create %entry1, %entry2: !om.string, !om.integer
       om.class.field @map_create, %map : !om.map<!om.string, !om.integer>
+
+      %true = om.constant true
+      om.class.field @true, %true : i1
+      %false = om.constant false
+      om.class.field @false, %false : i1
     }
 
     om.class @Child(%0: !om.integer) {
@@ -157,7 +162,7 @@
 
 # CHECK: 14
 print(obj.child.foo)
-# CHECK: loc("-":60:7)
+# CHECK: loc("-":65:7)
 print(obj.child.get_field_loc("foo"))
 # CHECK: ('Root', 'x')
 print(obj.reference)
@@ -224,6 +229,11 @@
   # CHECK-NEXT: Y 15
   print(k, v)
 
+# CHECK: True
+print(obj.true)
+# CHECK: False
+print(obj.false)
+
 obj = evaluator.instantiate("Client")
 object_dict: Dict[om.Object, str] = {}
 for field_name, data in obj:

lib/Bindings/Python/OMModule.cpp

@@ -366,15 +366,6 @@ Map::dunderGetItem(std::variant<intptr_t, std::string, MlirAttribute> key) {
 // Convert a generic MLIR Attribute to a PythonValue. This is basically a C++
 // fast path of the parts of attribute_to_var that we use in the OM dialect.
 static PythonPrimitive omPrimitiveToPythonValue(MlirAttribute attr) {
-  if (mlirAttributeIsAInteger(attr)) {
-    MlirType type = mlirAttributeGetType(attr);
-    if (mlirTypeIsAIndex(type) || mlirIntegerTypeIsSignless(type))
-      return py::int_(mlirIntegerAttrGetValueInt(attr));
-    if (mlirIntegerTypeIsSigned(type))
-      return py::int_(mlirIntegerAttrGetValueSInt(attr));
-    return py::int_(mlirIntegerAttrGetValueUInt(attr));
-  }
-
   if (omAttrIsAIntegerAttr(attr)) {
     auto strRef = omIntegerAttrToString(attr);
     return py::int_(py::str(strRef.data, strRef.length));
@@ -389,10 +380,20 @@ static PythonPrimitive omPrimitiveToPythonValue(MlirAttribute attr) {
     return py::str(strRef.data, strRef.length);
   }
 
+  // BoolAttr's are IntegerAttr's, check this first.
   if (mlirAttributeIsABool(attr)) {
     return py::bool_(mlirBoolAttrGetValue(attr));
   }
 
+  if (mlirAttributeIsAInteger(attr)) {
+    MlirType type = mlirAttributeGetType(attr);
+    if (mlirTypeIsAIndex(type) || mlirIntegerTypeIsSignless(type))
+      return py::int_(mlirIntegerAttrGetValueInt(attr));
+    if (mlirIntegerTypeIsSigned(type))
+      return py::int_(mlirIntegerAttrGetValueSInt(attr));
+    return py::int_(mlirIntegerAttrGetValueUInt(attr));
+  }
+
   if (omAttrIsAReferenceAttr(attr)) {
     auto innerRef = omReferenceAttrGetInnerRef(attr);
     auto moduleStrRef =