[compiler-rt] [ASan][Windows] Honor asan config flags on windows when set through the user function (PR #122990)

[David Justo via llvm-commits]

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@@ -460,6 +492,13 @@ static bool AsanInitInternal() {
   allocator_options.SetFrom(flags(), common_flags());
   InitializeAllocator(allocator_options);
 
+  // Apply ASan flags.
+  // NOTE: In order for options specified through `__asan_default_options` to be
+  // honored on Windows, it is necessary for those options to be configured
+  // inside the `ApplyOptions` method. See the function-level comment for
+  // `ApplyFlags` for more details.
+  ApplyFlags();
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davidmrdavid wrote:

I think we can definitely set `log_path` in both locations, that seems fine to me :) .
As for the optimizing of opening and closing file handles (I think that's what you mean here?), that might be tougher.

For simplicity, I'll opt to scope out the change to `__sanitizer_set_report_path(common_flags()->log_path);`. I'll leave it in its original location.

https://github.com/llvm/llvm-project/pull/122990