[compiler-rt] [compiler-rt] Allow running tests without installing first (PR #83088)

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``````````bash
darker --check --diff -r 73dfc7bbadddeb2930b11e4ad07f9a8e8b498cc7...9c8044e53c8757a8f6066521ae7ade15b2951c1c compiler-rt/test/fuzzer/lit.cfg.py compiler-rt/test/lit.common.cfg.py compiler-rt/test/safestack/lit.cfg.py
``````````

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``````````diff
--- lit.common.cfg.py	2024-02-27 19:12:27.000000 +0000
+++ lit.common.cfg.py	2024-03-02 03:12:24.672285 +0000
@@ -31,10 +31,11 @@
         if allow_failure:
             lit_config.warning(msg)
         else:
             lit_config.fatal(msg)
     return path, clang_cmd
+
 
 def find_compiler_libdir():
     """
     Returns the path to library resource directory used
     by the compiler.
@@ -184,12 +185,14 @@
     lit_config.note(f"Resource dir for {config.clang} is {test_cc_resource_dir}")
 local_build_resource_dir = os.path.realpath(config.compiler_rt_output_dir)
 if test_cc_resource_dir != local_build_resource_dir:
     if config.test_standalone_build_libs and config.compiler_id == "Clang":
         if lit_config.debug:
-            lit_config.note(f'Overriding test compiler resource dir to use '
-                            f'libraries in "{config.compiler_rt_libdir}"')
+            lit_config.note(
+                f"Overriding test compiler resource dir to use "
+                f'libraries in "{config.compiler_rt_libdir}"'
+            )
         # Ensure that we use the just-built static libraries when linking by
         # overriding the Clang resource directory. Additionally, we want to use
         # the builtin headers shipped with clang (e.g. stdint.h), so we
         # explicitly add this as an include path (since the headers are not
         # going to be in the current compiler-rt build directory).
--- safestack/lit.cfg.py	2024-02-27 00:59:08.000000 +0000
+++ safestack/lit.cfg.py	2024-03-02 03:12:24.724391 +0000
@@ -11,14 +11,20 @@
 # Test suffixes.
 config.suffixes = [".c", ".cpp", ".m", ".mm", ".ll", ".test"]
 
 # Add clang substitutions.
 config.substitutions.append(
-    ("%clang_nosafestack ", config.clang + config.target_cflags + " -O0 -fno-sanitize=safe-stack ")
+    (
+        "%clang_nosafestack ",
+        config.clang + config.target_cflags + " -O0 -fno-sanitize=safe-stack ",
+    )
 )
 config.substitutions.append(
-    ("%clang_safestack ", config.clang + config.target_cflags + " -O0 -fsanitize=safe-stack ")
+    (
+        "%clang_safestack ",
+        config.clang + config.target_cflags + " -O0 -fsanitize=safe-stack ",
+    )
 )
 
 if config.lto_supported:
     config.substitutions.append(
         (

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https://github.com/llvm/llvm-project/pull/83088