V8: Move x87 builders to new master.

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 598 matching lines @@
         ],
         "excluded_builders" : [
           "V8 Linux - swarming staging",
           "V8 Linux - debug - greedy allocator",
           "V8 Linux64 - debug - greedy allocator",
           "V8 Linux64 - cfi",
           "V8 Linux64 - gcov coverage",
           "V8 Linux - mipsel - sim",
           "V8 Linux - ppc - sim",
           "V8 Linux - ppc64 - sim",
-          "V8 Linux - x87 - nosnap - debug builder",
-          "V8 Linux - x87 - nosnap - debug",
           "V8 Linux - full debug",
           "V8 Linux - interpreted regexp",
           "V8 Arm",
           "V8 Arm - debug",
           "V8 Arm GC Stress",
           "V8 Mips - big endian - nosnap - 1",
           "V8 Mips - big endian - nosnap - 2",
           "V8 Random Deopt Fuzzer - debug"
         ],
         "builders": {
@@ skipping 314 matching lines @@
         "cleanup_temp",
         "taskkill"
       ],
       "closing_optional": [
         "compile",
         "gn"
       ]
     }
   }
 }