Fix python SyntaxWarnings in check-all output (#72538)

By converting the offending strings to raw string literals.

Author: eleftg

clang/lib/Tooling/DumpTool/generate_cxx_src_locs.py

@@ -25,7 +25,7 @@ def __init__(self, templateClasses):
 
     def GeneratePrologue(self):
 
-        self.implementationContent += """
+        self.implementationContent += r"""
 /*===- Generated file -------------------------------------------*- C++ -*-===*\
 |*                                                                            *|
 |* Introspection of available AST node SourceLocations                        *|

compiler-rt/test/lit.common.cfg.py

@@ -800,7 +800,7 @@ def is_windows_lto_supported():
         config.substitutions.append(
             (
                 "%ld_flags_rpath_exe" + postfix,
-                "-Wl,-z,origin -Wl,-rpath,\$ORIGIN -L%T -l%xdynamiclib_namespec"
+                r"-Wl,-z,origin -Wl,-rpath,\$ORIGIN -L%T -l%xdynamiclib_namespec"
                 + postfix,
             )
         )
@@ -809,15 +809,15 @@ def is_windows_lto_supported():
         config.substitutions.append(
             (
                 "%ld_flags_rpath_exe" + postfix,
-                "-Wl,-rpath,\$ORIGIN -L%T -l%xdynamiclib_namespec" + postfix,
+                r"-Wl,-rpath,\$ORIGIN -L%T -l%xdynamiclib_namespec" + postfix,
             )
         )
         config.substitutions.append(("%ld_flags_rpath_so" + postfix, ""))
     elif config.host_os == "SunOS":
         config.substitutions.append(
             (
                 "%ld_flags_rpath_exe" + postfix,
-                "-Wl,-R\$ORIGIN -L%T -l%xdynamiclib_namespec" + postfix,
+                r"-Wl,-R\$ORIGIN -L%T -l%xdynamiclib_namespec" + postfix,
             )
         )
         config.substitutions.append(("%ld_flags_rpath_so" + postfix, ""))

llvm/test/lit.cfg.py

@@ -271,7 +271,7 @@ def ptxas_version(ptxas):
     ptxas_cmd = subprocess.Popen([ptxas, "--version"], stdout=subprocess.PIPE)
     ptxas_out = ptxas_cmd.stdout.read().decode("ascii")
     ptxas_cmd.wait()
-    match = re.search("release (\d+)\.(\d+)", ptxas_out)
+    match = re.search(r"release (\d+)\.(\d+)", ptxas_out)
     if match:
         return (int(match.group(1)), int(match.group(2)))
     print("couldn't determine ptxas version")