Update builders config for previous branch coverage

Bug: v8:10336
Change-Id: I46af204cd25b0e0d3a300e1449939f502b757d3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2107842Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66773}

infra/testing/builders.pyl

@@ -1691,6 +1691,26 @@
       {'name': 'v8testing', 'shards': 3},
     ],
   },
+  'V8 Linux - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'variant': 'default'},
+      {'name': 'v8testing'},
+    ],
+  },
+  'V8 Linux - previous branch - debug': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'variant': 'default'},
+      {'name': 'v8testing', 'shards': 3},
+    ],
+  },
   'V8 Linux64 - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1731,6 +1751,26 @@
       {'name': 'v8testing', 'shards': 3},
     ],
   },
+  'V8 Linux64 - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'variant': 'default'},
+      {'name': 'v8testing'},
+    ],
+  },
+  'V8 Linux64 - previous branch - debug': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'variant': 'default'},
+      {'name': 'v8testing', 'shards': 3},
+    ],
+  },
   'V8 arm - sim - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1771,6 +1811,26 @@
       {'name': 'v8testing', 'shards': 10},
     ],
   },
+  'V8 arm - sim - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'variant': 'default'},
+      {'name': 'v8testing', 'shards': 4},
+    ],
+  },
+  'V8 arm - sim - previous branch - debug': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'mozilla', 'shards': 2},
+      {'name': 'test262', 'variant': 'default', 'shards': 2},
+      {'name': 'v8testing', 'shards': 10},
+    ],
+  },
   'V8 mips64el - sim - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1787,6 +1847,14 @@
       {'name': 'unittests'},
     ],
   },
+  'V8 mips64el - sim - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'unittests'},
+    ],
+  },
   'V8 mipsel - sim - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1803,6 +1871,14 @@
       {'name': 'v8testing', 'shards': 4},
     ],
   },
+  'V8 mipsel - sim - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'v8testing', 'shards': 4},
+    ],
+  },
   'V8 ppc64 - sim - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1819,6 +1895,14 @@
       {'name': 'unittests'},
     ],
   },
+  'V8 ppc64 - sim - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'unittests'},
+    ],
+  },
   'V8 s390x - sim - beta branch': {
     'swarming_dimensions': {
       'os': 'Ubuntu-16.04',
@@ -1835,4 +1919,12 @@
       {'name': 'unittests'},
     ],
   },
+  'V8 s390x - sim - previous branch': {
+    'swarming_dimensions': {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'unittests'},
+    ],
+  },
 }