[polly] fix(polly/**.py): fix invalid escape sequences (PR #94037)

[Eisuke Kawashima via llvm-commits]

https://github.com/e-kwsm updated https://github.com/llvm/llvm-project/pull/94037

>From f3e24ac1da6b6272cf30558d3bf79242971f37a8 Mon Sep 17 00:00:00 2001
From: Eisuke Kawashima <e-kwsm at users.noreply.github.com>
Date: Sat, 11 May 2024 02:39:21 +0900
Subject: [PATCH] fix(polly/**.py): fix invalid escape sequences

---
 polly/test/update_check.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/polly/test/update_check.py b/polly/test/update_check.py
index 88d95c247c0630..a973c72ff4e78e 100644
--- a/polly/test/update_check.py
+++ b/polly/test/update_check.py
@@ -222,7 +222,12 @@ def classyfier2(lines):
         line = i.__next__()
 
 
-replrepl = {"{{": "{{[{][{]}}", "}}": "{{[}][}]}}", "[[": "{{\[\[}}", "]]": "{{\]\]}}"}
+replrepl = {
+    "{{": "{{[{][{]}}",
+    "}}": "{{[}][}]}}",
+    "[[": r"{{\[\[}}",
+    "]]": r"{{\]\]}}",
+}
 replre = re.compile("|".join(re.escape(k) for k in replrepl.keys()))
 
 
@@ -452,7 +457,7 @@ def main():
     checkre = re.compile(
         r"^\s*\;\s*("
         + "|".join([re.escape(s) for s in checkprefixes])
-        + ")(\-NEXT|\-DAG|\-NOT|\-LABEL|\-SAME)?\s*\:"
+        + r")(\-NEXT|\-DAG|\-NOT|\-LABEL|\-SAME)?\s*\:"
     )
     firstcheckline = None
     firstnoncommentline = None