[compiler-rt] [compiler-rt][test] Remove noisy warnings (PR #191510)

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``````````diff
--- lit.cfg.py	2026-04-22 20:50:08.000000 +0000
+++ lit.cfg.py	2026-04-22 20:51:17.414607 +0000
@@ -68,11 +68,11 @@
 config.substitutions.append(("%python", '"%s"' % (sys.executable)))
 
 
 def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True, msan_enabled=False):
     compiler_cmd = config.clang
-    extra_cmd = ''
+    extra_cmd = ""
 
     if is_cpp:
         std_cmd = "--driver-mode=g++"
     else:
         std_cmd = ""

``````````

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https://github.com/llvm/llvm-project/pull/191510