[tests] Exercise Turbofan's instruction scheduling

Turbofan's instruction scheduling is currently only enabled for
mksnapshot and has thus little test coverage. This CL introduces two
new test variants, "instruction_scheduling" and
"stress_instruction_scheduling", and activates them on a selection of
bots.

Change-Id: I5917fc781e289377c58f584c770c91e31765b2de
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1899778
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64807}

infra/testing/builders.pyl

@@ -271,6 +271,7 @@
       {'name': 'v8testing', 'shards': 3},
       {'name': 'v8testing', 'variant': 'extra', 'shards': 2},
       {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
+      {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
     ],
   },
   'v8_linux64_gc_stress_custom_snapshot_dbg_ng_triggered': {
@@ -327,6 +328,7 @@
       {'name': 'v8testing', 'shards': 2},
       {'name': 'v8testing', 'variant': 'assert_types'},
       {'name': 'v8testing', 'variant': 'extra'},
+      {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
     ],
   },
   'v8_linux64_perfetto_dbg_ng_triggered': {
@@ -362,6 +364,7 @@
       {'name': 'v8testing', 'variant': 'extra'},
       {'name': 'v8testing', 'variant': 'minor_mc'},
       {'name': 'v8testing', 'variant': 'slow_path'},
+      {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
     ],
   },
   # TODO(machenbach): Experimental builder with incomplete configs. Should be
@@ -833,6 +836,7 @@
       {'name': 'v8testing', 'variant': 'assert_types'},
       {'name': 'v8testing', 'variant': 'extra'},
       {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
+      {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
       # Noavx.
       {
         'name': 'mozilla',
@@ -890,6 +894,7 @@
       {'name': 'v8testing', 'variant': 'extra'},
       {'name': 'v8testing', 'variant': 'minor_mc', 'shards': 1},
       {'name': 'v8testing', 'variant': 'slow_path', 'shards': 1},
+      {'name': 'v8testing', 'variant': 'stress_instruction_scheduling'},
       # Noavx.
       {
         'name': 'mozilla',

tools/testrunner/local/variants.py

@@ -27,12 +27,14 @@ ALL_VARIANT_FLAGS = {
   "stress_js_bg_compile_wasm_code_gc": [["--stress-background-compile",
                                          "--wasm-code-gc",
                                          "--stress-wasm-code-gc"]],
-  "stress_incremental_marking":  [["--stress-incremental-marking"]],
+  "stress_incremental_marking": [["--stress-incremental-marking"]],
   # Trigger stress sampling allocation profiler with sample interval = 2^14
   "stress_sampling": [["--stress-sampling-allocation-profiler=16384"]],
   "trusted": [["--no-untrusted-code-mitigations"]],
   "no_wasm_traps": [["--no-wasm-trap-handler"]],
   "turboprop": [["--turboprop"]],
+  "instruction_scheduling": [["--turbo-instruction-scheduling"]],
+  "stress_instruction_scheduling": [["--turbo-stress-instruction-scheduling"]],
   "top_level_await": [["--harmony-top-level-await"]],
 }
 

tools/testrunner/standard_runner.py

@@ -46,7 +46,8 @@ VARIANT_ALIASES = {
   # Shortcut for the two above ('more' first - it has the longer running tests)
   'exhaustive': MORE_VARIANTS + VARIANTS,
   # Additional variants, run on a subset of bots.
-  'extra': ['nooptimization', 'future', 'no_wasm_traps', 'turboprop'],
+  'extra': ['nooptimization', 'future', 'no_wasm_traps', 'turboprop',
+            'instruction_scheduling'],
 }
 
 GC_STRESS_FLAGS = ['--gc-interval=500', '--stress-compaction',