[gn] try to port b1be213 even more

Bots are now failing check-hwasan with

    llvm-lit: .../llvm/utils/lit/lit/llvm/subst.py:133: fatal: Did not find
        hwasan_symbolize in .../out/gn/stage2_unix/bin

This time it's the right fix for sure!

Author: nico

llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn

@@ -55,7 +55,8 @@ write_cmake_config("lit_common_configured") {
     "COMPILER_RT_ENABLE_INTERNAL_SYMBOLIZER_PYBOOL=False",
     "COMPILER_RT_HAS_NO_DEFAULT_CONFIG_FLAG_PYBOOL=True",
     "COMPILER_RT_INTERCEPT_LIBDISPATCH_PYBOOL=False",
-    "COMPILER_RT_RESOLVED_EXEC_OUTPUT_DIR=" + rebase_path("$root_out_dir/bin"),
+    "COMPILER_RT_RESOLVED_EXEC_OUTPUT_DIR=" +
+        rebase_path("$root_build_dir/bin"),
     "COMPILER_RT_RESOLVED_LIBRARY_OUTPUT_DIR=" +
         rebase_path(crt_current_out_dir),
     "COMPILER_RT_RESOLVED_OUTPUT_DIR=" + rebase_path(crt_current_out_dir),