fix(libcxx/**.py): fix invalid escape sequences

Author: e-kwsm

libcxx/test/libcxx/transitive_includes.gen.py

@@ -59,7 +59,7 @@
       continue
 
     # Escape slashes for the awk command below
-    escaped_header = header.replace('/', '\/')
+    escaped_header = header.replace('/', r'\/')
 
     print(f"""\
 //--- {header}.sh.cpp

libcxx/utils/generate_escaped_output_table.py

@@ -84,7 +84,7 @@ def compactPropertyRanges(input: list[PropertyRange]) -> list[PropertyRange]:
     return result
 
 
-DATA_ARRAY_TEMPLATE = """
+DATA_ARRAY_TEMPLATE = r"""
 /// The entries of the characters to escape in format's debug string.
 ///
 /// Contains the entries for [format.string.escaped]/2.2.1.2.1

libcxx/utils/generate_width_estimation_table.py

@@ -99,7 +99,7 @@ def compactPropertyRanges(input: list[PropertyRange]) -> list[PropertyRange]:
     return result
 
 
-DATA_ARRAY_TEMPLATE = """
+DATA_ARRAY_TEMPLATE = r"""
 /// The entries of the characters with an estimated width of 2.
 ///
 /// Contains the entries for [format.string.std]/12