[lldb] Parse image high address from JSON crashlogs

Use the base + size to correctly populate the image high address when
parsing JSON crashlogs.

Differential revision: https://reviews.llvm.org/D148053

(cherry picked from commit b67b7bb)

Author: JDevlieghere

lldb/examples/python/crashlog.py

@@ -510,7 +510,8 @@ def parse_images(self, json_images):
         for json_image in json_images:
             img_uuid = uuid.UUID(json_image['uuid'])
             low = int(json_image['base'])
-            high = int(0)
+            high = low + int(
+                json_image['size']) if 'size' in json_image else low
             name = json_image['name'] if 'name' in json_image else ''
             path = json_image['path'] if 'path' in json_image else ''
             version = ''