ppc/s390: enable liftoff testing

Change-Id: I65c60a17c0f8fe19b49f0661b9d57b5a504abe07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3168283Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76974}

test/cctest/cctest.status

@@ -523,11 +523,6 @@
 ['arch == ppc64', {
   # https://crbug.com/v8/8766
   'test-bytecode-generator/WideRegisters': [SKIP],
-  # Liftoff is not currently supported on ppc
-  'test-liftoff-*': [SKIP],
-  'test-gc/RunWasmLiftoff*': [SKIP],
-  'test-run-wasm-module/Run_WasmModule_CompilationHintsNoTiering': [SKIP],
-  'test-wasm-serialization/TierDownAfterDeserialization': [SKIP],
 }],
 
 ##############################################################################

test/mjsunit/mjsunit.status

@@ -1279,10 +1279,10 @@
 }], # arch != x64 or deopt_fuzzer
 
 ##############################################################################
-# Liftoff is currently only sufficiently implemented on x64, ia32, arm64 and
-# arm.
+# Liftoff is currently only sufficiently implemented on x64, ia32, arm64,
+# arm, ppc64 and s390x.
 # TODO(clemensb): Implement on all other platforms (crbug.com/v8/6600).
-['arch not in (x64, ia32, arm64, arm)', {
+['arch not in (x64, ia32, arm64, arm, ppc64, s390x)', {
   'wasm/liftoff': [SKIP],
   'wasm/liftoff-debug': [SKIP],
   'wasm/tier-up-testing-flag': [SKIP],
@@ -1290,7 +1290,7 @@
   'wasm/wasm-dynamic-tiering': [SKIP],
   'wasm/test-partial-serialization': [SKIP],
   'regress/wasm/regress-1248024': [SKIP],
-}], # arch not in (x64, ia32, arm64, arm)
+}], # arch not in (x64, ia32, arm64, arm, ppc64 and s390x)
 
 ##############################################################################
 ['system != linux or virtual_memory_cage == True', {