V8 Buildbot: Split x87 into builder/tester.

scripts/slave/gatekeeper.json

 {
   "comment": ["This is a configuration file for gatekeeper_ng.py",
               "Look at that for documentation on this file's format."],
 
   "masters": {
     "https://build.chromium.org/p/chromium": [
       {
         "categories": [
           "chromium_tree_closer"
         ],
@@ skipping 374 matching lines @@
       {
         "categories": [
           "v8_all"
         ],
         "excluded_builders" : [
           "V8 Linux - mipsel - sim - builder",
           "V8 Linux - mips64el - sim - builder",
           "V8 Linux - mipsel - sim",
           "V8 Linux - ppc - sim",
           "V8 Linux - ppc64 - sim",
+          "V8 Linux - x87 - nosnap - debug builder",
           "V8 Linux - x87 - nosnap - debug",
           "V8 Linux64 - custom snapshot - debug",
           "V8 Linux - full debug",
           "V8 Linux - interpreted regexp",
           "V8 Linux - arm - sim - novfp3",
           "V8 Linux - arm - sim - debug - novfp3",
           "V8 Linux - arm64 - sim - nosnap - debug - 1",
           "V8 Linux - arm64 - sim - nosnap - debug - 2",
           "V8 Linux - arm64 - sim - gc stress",
           "V8 Mac GC Stress",
@@ skipping 340 matching lines @@
       "forgiving_optional": [
         "svnkill",
         "taskkill"
       ],
       "closing_optional": [
         "compile"
       ]
     }
   }
 }