Turn off syzygy_optimize by default when is_syzyasan is on.

This correctly matches the GYP behavior.

R=brettw@chromium.org, sebmarchand@chromium.org
BUG=632563

Review-Url: https://codereview.chromium.org/2199603002
Cr-Commit-Position: refs/heads/master@{#408894}

build/config/compiler/compiler.gni

@@ -62,7 +62,7 @@ declare_args() {
   # Generate Syzygy optimized binaries. Syzygy optimize mode is a profile
   # guided optimization that reorders code for better locality.
   syzygy_optimize = is_win && target_cpu == "x86" && is_official_build &&
-                    !is_clang && !is_win_fastlink
+                    !is_clang && !is_win_fastlink && !is_syzyasan
 }
 
 declare_args() {