[llvm] [lit] Update internal shell lexer to handle LLDB persistent vars. (PR #156125)

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darker --check --diff -r origin/main...HEAD llvm/utils/lit/lit/ShUtil.py llvm/utils/lit/tests/unit/ShUtil.py
``````````

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``````````diff
--- tests/unit/ShUtil.py	2025-09-02 23:57:58.000000 +0000
+++ tests/unit/ShUtil.py	2025-09-03 00:01:17.250949 +0000
@@ -26,12 +26,13 @@
         self.assertEqual(self.lex(""" "hello\\\\world" """), ["hello\\world"])
         self.assertEqual(self.lex(""" he"llo wo"rld """), ["hello world"])
         self.assertEqual(self.lex(""" a\\ b a\\\\b """), ["a b", "a\\b"])
         self.assertEqual(self.lex(""" "" "" """), ["", ""])
         self.assertEqual(self.lex(""" a\\ b """, win32Escapes=True), ["a\\", "b"])
-        self.assertEqual(self.lex("\"\\$y = 11\""), ["$y = 11"])
-        self.assertEqual(self.lex("\"expr \\$y = 11\""), ["expr $y = 11"])
+        self.assertEqual(self.lex('"\\$y = 11"'), ["$y = 11"])
+        self.assertEqual(self.lex('"expr \\$y = 11"'), ["expr $y = 11"])
+
 
 class TestShParse(unittest.TestCase):
     def parse(self, str):
         return ShParser(str).parse()
 

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https://github.com/llvm/llvm-project/pull/156125