[compiler-rt] [compiler-rt][sanitizer_common] Improve handling of env vars for iOS simulator tests (PR #146721)

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``````````bash
darker --check --diff -r HEAD~1...HEAD compiler-rt/test/sanitizer_common/ios_commands/iossim_env.py compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py compiler-rt/test/sanitizer_common/lit.common.cfg.py
``````````

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View the diff from darker here.
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``````````diff
--- ios_commands/iossim_env.py	2025-07-02 15:01:12.000000 +0000
+++ ios_commands/iossim_env.py	2025-07-02 15:22:14.228978 +0000
@@ -3,15 +3,15 @@
 import os, sys, subprocess
 
 
 idx = 1
 for arg in sys.argv[1:]:
-  if not "=" in arg:
-    break
-  idx += 1
-  (argname, argval) = arg.split("=", maxsplit=1)
-  os.environ["SIMCTL_CHILD_" + argname] = argval
+    if not "=" in arg:
+        break
+    idx += 1
+    (argname, argval) = arg.split("=", maxsplit=1)
+    os.environ["SIMCTL_CHILD_" + argname] = argval
 
 exitcode = subprocess.call(sys.argv[idx:])
 if exitcode > 125:
   exitcode = 126
 sys.exit(exitcode)
--- ios_commands/iossim_run.py	2025-07-02 15:01:12.000000 +0000
+++ ios_commands/iossim_run.py	2025-07-02 15:22:14.256803 +0000
@@ -19,11 +19,11 @@
     "LSAN_OPTIONS",
     "APPLE_ASAN_INIT_FOR_DLOPEN",
     "ASAN_ACTIVATION_OPTIONS",
     "MallocNanoZone",
 ]:
-    simctl_version = "SIMCTL_CHILD_" + e 
+    simctl_version = "SIMCTL_CHILD_" + e
     # iossim_env.py might have already set these using arguments it was given
     # (and that we can't see from inside this script). Don't overwrite them!
     if e in os.environ and simctl_version not in os.environ:
         os.environ[simctl_version] = os.environ[e]
 

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https://github.com/llvm/llvm-project/pull/146721