stdlib: Fix PyStats Distribution to be vector of Scalars

As Distribution inherits from Vector, it should be constructed with
a Dictionary of scalars (in our implementation, a dictionary mapping the
vector position's unique id for each bin and the value of that bin).

Change-Id: Ie603c248e5db4b6dd7f71cc453eebd78793f69a3

src/python/m5/ext/pystats/statistic.py

@@ -164,7 +164,7 @@ class Distribution(Vector):
 
     def __init__(
         self,
-        value: Iterable[int],
+        value: Dict[Union[int, float], Scalar],
         min: Union[float, int],
         max: Union[float, int],
         num_bins: int,

src/python/m5/stats/gem5stats.py

@@ -167,8 +167,16 @@ def __get_distribution(statistic: _m5.stats.DistInfo) -> Distribution:
     overflow = statistic.overflow
     logs = statistic.logs
 
+    parsed_values = {}
+    for index in range(len(value)):
+        parsed_values[index] = Scalar(
+            value=value[index],
+            unit=statistic.unit,
+            datatype=StorageType["f64"],
+        )
+
     return Distribution(
-        value=value,
+        value=parsed_values,
         min=min,
         max=max,
         num_bins=num_bins,