[wasm][mv] Enable WebAssembly multi-value

Intent to Ship thread on blink-dev:
https://groups.google.com/a/chromium.org/g/blink-dev/c/K4-P5rq7FbY

Spec repository:
https://github.com/WebAssembly/multi-value/

WebAssembly multi-value is ready to ship. The proposal is now merged
into the core WebAssembly spec, and is implemented in both TurboFan and
Liftoff.

R=ecmziegler@chromium.org

Bug: chromium:1097717
Change-Id: Id53ee318cacae1bc9dd9d9611f9223de594a99b7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2257225Reviewed-by: Emanuel Ziegler <ecmziegler@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68459}

src/wasm/wasm-feature-flags.h

@@ -55,12 +55,6 @@
   /* Staged in v7.8. */                                                        \
   V(reftypes, "reference type opcodes", false)                                 \
                                                                                \
-  /* Multi-value proposal. */                                                  \
-  /* https://github.com/WebAssembly/multi-value */                             \
-  /* V8 side owner: thibaudm */                                                \
-  /* Staged in v8.0. */                                                        \
-  V(mv, "multi-value support", false)                                          \
-                                                                               \
   /* Threads proposal. */                                                      \
   /* https://github.com/webassembly/threads */                                 \
   /* NOTE: This is enabled via chromium flag on desktop systems since v7.4  */ \
@@ -92,7 +86,14 @@
   /* V8 side owner: binji */                                                   \
   /* Shipped in v7.5. */                                                       \
   /* ITS: https://groups.google.com/forum/#!topic/v8-users/zM05lYEBVog */      \
-  V(bulk_memory, "bulk memory opcodes", true)
+  V(bulk_memory, "bulk memory opcodes", true)                                  \
+                                                                               \
+  /* Multi-value proposal. */                                                  \
+  /* https://github.com/WebAssembly/multi-value */                             \
+  /* V8 side owner: thibaudm */                                                \
+  /* Shipped in v8.5. */                                                       \
+  /* ITS: https://groups.google.com/g/v8-users/c/pv2E4yFWeF0 */                \
+  V(mv, "multi-value support", true)
 
 // Combination of all available wasm feature flags.
 #define FOREACH_WASM_FEATURE_FLAG(V)        \

test/wasm-spec-tests/testcfg.py

@@ -51,8 +51,7 @@ class TestCase(testcase.D8TestCase):
     for proposal in proposal_flags:
       if os.sep.join(['proposals', proposal['name']]) in self.path:
         return proposal['flags']
-    # TODO(thibaudm): Remove the flag once multi-value is shipped in V8.
-    return ['--experimental-wasm-mv']
+    return []
 
 
 def GetSuite(*args, **kwargs):