[llvm] [utils][filecheck-lint]: speedup filecheck_lint (PR #94191)

[via llvm-commits]

================
@@ -78,32 +78,41 @@ def levenshtein(s1: str, s2: str) -> int:  # pylint: disable=g-doc-args
 
 
 class FileRange:
-    """Stores the coordinates of a span on a single line within a file.
+    """Derives the coordinates of a span on a single line within a file.
 
     Attributes:
-      line:         the line number
-      start_column: the (inclusive) column where the span starts
-      end_column:   the (inclusive) column where the span ends
+      content:      line str
+      start_byte: the (inclusive) byte offset the span starts
+      end_byte:   the (inclusive) byte offset the span ends
     """
 
-    line: int
-    start_column: int
-    end_column: int
+    content: str
+    start_byte: int
+    end_byte: int
 
     def __init__(
         self, content: str, start_byte: int, end_byte: int
     ):  # pylint: disable=g-doc-args
-        """Derives a span's coordinates based on a string and start/end bytes.
----------------
klensy wrote:

Why comment even needed for constructor? There already doc comment for class, so i moved it into class.

https://github.com/llvm/llvm-project/pull/94191