[wasm-simd] Remove post-MVP SIMD flag

Change-Id: I3ed8ff431fcfe93d61dd764a0d9f22fd20962f51
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2780219Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73588}

src/flags/flag-definitions.h

@@ -966,11 +966,7 @@ DEFINE_DEBUG_BOOL(trace_wasm_lazy_compilation, false,
                   "trace lazy compilation of wasm functions")
 DEFINE_BOOL(wasm_lazy_validation, false,
             "enable lazy validation for lazily compiled wasm functions")
-DEFINE_BOOL(wasm_simd_post_mvp, false,
-            "allow experimental SIMD operations for prototyping that are not "
-            "included in the current proposal")
 DEFINE_BOOL(wasm_simd_ssse3_codegen, false, "allow wasm SIMD SSSE3 codegen")
-DEFINE_IMPLICATION(wasm_simd_post_mvp, experimental_wasm_simd)
 
 DEFINE_BOOL(wasm_code_gc, true, "enable garbage collection of wasm code")
 DEFINE_BOOL(trace_wasm_code_gc, false, "trace garbage collection of wasm code")

test/cctest/wasm/test-run-wasm-simd.cc

@@ -279,26 +279,6 @@ int64_t LessEqual(double a, double b) { return a <= b ? -1 : 0; }
   void RunWasm_##name##_Impl(LowerSimd lower_simd,                        \
                              TestExecutionTier execution_tier)
 
-// Use this for post-mvp instructions, for which we only implement interpreter
-// and TurboFan support. Liftoff support is generally not implemented yet, so
-// don't test that, and neither is scalar lowering.
-#define WASM_SIMD_TEST_POST_MVP(name)                                     \
-  void RunWasm_##name##_Impl(LowerSimd lower_simd,                        \
-                             TestExecutionTier execution_tier);           \
-  TEST(RunWasm_##name##_turbofan) {                                       \
-    if (!CpuFeatures::SupportsWasmSimd128()) return;                      \
-    EXPERIMENTAL_FLAG_SCOPE(simd);                                        \
-    FLAG_SCOPE(wasm_simd_post_mvp);                                       \
-    RunWasm_##name##_Impl(kNoLowerSimd, TestExecutionTier::kTurbofan);    \
-  }                                                                       \
-  TEST(RunWasm_##name##_interpreter) {                                    \
-    EXPERIMENTAL_FLAG_SCOPE(simd);                                        \
-    FLAG_SCOPE(wasm_simd_post_mvp);                                       \
-    RunWasm_##name##_Impl(kNoLowerSimd, TestExecutionTier::kInterpreter); \
-  }                                                                       \
-  void RunWasm_##name##_Impl(LowerSimd lower_simd,                        \
-                             TestExecutionTier execution_tier)
-
 #if V8_OS_AIX
 template <typename T>
 bool MightReverseSign(T float_op) {