[CQ] Temporarily drop gcc bots from CQ

NOTRY=true
NOTREECHECKS=true
TBR=yangguo@chromium.org

Bug: chromium:814810
Change-Id: Ibf9d5d637f4e98a295d0cde6632679c77c3a4eb3
Reviewed-on: https://chromium-review.googlesource.com/931921Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51478}

infra/config/cq.cfg

@@ -30,7 +30,10 @@ verifiers {
         name: "v8_linux64_asan_rel_ng_triggered"
         triggered_by: "v8_linux64_asan_rel_ng"
       }
-      builders { name: "v8_linux64_gcc_compile_dbg" }
+      builders {
+        name: "v8_linux64_gcc_compile_dbg"
+        experiment_percentage: 100
+      }
       builders { name: "v8_linux64_rel_ng" }
       builders {
         name: "v8_linux64_rel_ng_triggered"
@@ -65,7 +68,10 @@ verifiers {
         name: "v8_linux_dbg_ng_triggered"
         triggered_by: "v8_linux_dbg_ng"
       }
-      builders { name: "v8_linux_gcc_compile_rel" }
+      builders {
+        name: "v8_linux_gcc_compile_rel"
+        experiment_percentage: 100
+      }
       builders { name: "v8_linux_mips64el_compile_rel" }
       builders { name: "v8_linux_mipsel_compile_rel" }
       builders { name: "v8_linux_nodcheck_rel_ng" }