Instrument setup.exe in the SyzyAsan builds.

chrome/tools/build/win/syzygy/BUILD.gn

Index: chrome/tools/build/win/syzygy/BUILD.gn
diff --git a/chrome/tools/build/win/syzygy/BUILD.gn b/chrome/tools/build/win/syzygy/BUILD.gn
index 08139f1bb3f592bbc4d3f59d6825b9aff6240655..30e4c2f20ba5e5cb0d78ce59552a403502a2647c 100644
--- a/chrome/tools/build/win/syzygy/BUILD.gn
+++ b/chrome/tools/build/win/syzygy/BUILD.gn
@@ -60,6 +60,18 @@ if (is_syzyasan) {
       }
     }
   }
+
+  syzygy_asan("setup_syzygy") {
+    binary_name = "setup.exe"
+    dest_dir = syzygy_dest_dir
+
+    # Defer the crash reporter initialization as the crash reporter isn't
+    # available at startup in setup.exe.
+    extra_args = [ "--defer-crash-reporter-initialization" ]
+    deps = [
+      "//chrome/installer/setup",
+    ]
+  }
 } else {
   # No syzygy. Generate dummy targets so other targets can unconditionally
   # depend on these without having to duplicate our conditions.