[test] Add more capacity and timeouts for slow builders

TBR=tmrts@chromium.org

Also skip some tests too slow in full debug mode.

Bug: v8:9145
Change-Id: Ied8781be26d2c1efd7720e333775da9f6d632236
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1598759
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61281}

infra/testing/builders.pyl

@@ -783,7 +783,7 @@
       'priority': 35,
     },
     'tests': [
-      {'name': 'v8testing', 'variant': 'default', 'shards': 3},
+      {'name': 'v8testing', 'variant': 'default', 'shards': 4},
     ],
   },
   'V8 Linux - gc stress': {

test/cctest/cctest.status

@@ -210,6 +210,13 @@
   'test-serialize/*': [SKIP],
 }],  # 'no_snap == True and system == windows'
 
+##############################################################################
+['is_full_debug', {
+  # Tests too slow in non-optimized debug mode.
+  'test-api/InternalFieldsSubclassing': [SKIP],
+  'test-heap/TestInternalWeakLists': [SKIP],
+}],  # 'is_full_debug'
+
 ##############################################################################
 ['byteorder == big', {
   # Skip WASM atomic tests on big-endian machines.

test/mjsunit/mjsunit.status

@@ -405,6 +405,14 @@
   'stack-traces-overflow': [SKIP],
 }], # lite_mode
 
+##############################################################################
+['is_full_debug', {
+  # Tests too slow in non-optimized debug mode.
+  'compiler/regress-9017': [SKIP],
+  'regress/regress-2790': [SKIP],
+  'regress/regress-740784': [SKIP],
+}],  # 'is_full_debug'
+
 ##############################################################################
 ['byteorder == big', {
   # Emscripten requires little-endian, skip all tests on big endian platforms.

tools/testrunner/base_runner.py

@@ -677,6 +677,7 @@ class BaseTestRunner(object):
       "gcov_coverage": self.build_config.gcov_coverage,
       "isolates": options.isolates,
       "is_clang": self.build_config.is_clang,
+      "is_full_debug": self.build_config.is_full_debug,
       "mips_arch_variant": mips_arch_variant,
       "mode": self.mode_options.status_mode
               if not self.build_config.dcheck_always_on
@@ -723,11 +724,11 @@ class BaseTestRunner(object):
     if self.build_config.lite_mode:
       factor *= 2
     if self.build_config.predictable:
-      factor *= 3
+      factor *= 4
     if self.build_config.use_sanitizer:
       factor *= 1.5
     if self.build_config.is_full_debug:
-      factor *= 2
+      factor *= 4
 
     return factor