[compiler-rt] [test] [builtins] Set __COMPAT_LAYER=RunAsInvoker when running tests

[mstorsjo]

Summary

Set __COMPAT_LAYER=RunAsInvoker to avoid the error
"[WinError 740] The requested operation requires elevation";
heuristics can flag "trampoline_setup_test" as an executable that
may need to be run with elevated privileges.

This is the same fix as D137772 and D148988, but applied on another
set of tests.

[vitalybuka]

Should we rather set it somewhere in llvm-project/llvm/utils/lit/lit/ ?

[mstorsjo]

In D149004#4301038, @vitalybuka wrote:

Should we rather set it somewhere in llvm-project/llvm/utils/lit/lit/ ?

Yes - D149064 does that. When that's landed, we can close this and D148988 (and revert D137772).

[mstorsjo]

Superseded by D149064.

compiler-rt/test/builtins/Unit/lit.cfg.py

else:
     builtins_source_feature_duplicates.append(builtin_source_feature)
 
 if len(builtins_source_feature_duplicates) > 0:
   lit_config.fatal(
     'builtins_source_features contains duplicates: {}'.format(
       builtins_source_feature_duplicates)
   )
 config.available_features.update(builtins_source_features)
+
+# Avoid Windows heuristics which try to detect potential installer programs
+# (which may need to run with elevated privileges) and ask if the user wants
+# to run them in that way. This heuristic may match for executables containing
+# the word "update", e.g. `TestCases/asan_update_allocation.cpp`. Set an
+# environment variable indicating that we want to execute them with the current
+# user.
+if config.host_os == 'Windows':
+  config.environment['__COMPAT_LAYER'] = 'RunAsInvoker'