Revert "[wasm-simd] Add bitmask to SIMD MVP"

This reverts commit dfbbb4a5.

Reason for revert: Bitmask added post 84 cut, so it is not part of origin trial. Therefore it is still a post-mvp.

Original change's description:
> [wasm-simd] Add bitmask to SIMD MVP
> 
> This removes the post-mvp flag for bitmask, since it was accepted into
> the proposal, see https://github.com/WebAssembly/simd/pull/201.
> 
> Bug: v8:10308
> Change-Id: I4ced43a6484660125d773bc9de46bdea9f72b13b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2216532
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67993}

TBR=gdeepti@chromium.org,zhin@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:10308
Change-Id: I53294be4ea816f37c7cc5f545afb572538dd4770
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233183Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68216}

src/compiler/backend/instruction-selector.cc

@@ -2662,6 +2662,11 @@ void InstructionSelector::VisitI64x2MaxU(Node* node) { UNIMPLEMENTED(); }
 
 #if !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_IA32 && \
     !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_S390X
+// TODO(v8:10308) Bitmask operations are in prototype now, we can remove these
+// guards when they go into the proposal.
+void InstructionSelector::VisitI8x16BitMask(Node* node) { UNIMPLEMENTED(); }
+void InstructionSelector::VisitI16x8BitMask(Node* node) { UNIMPLEMENTED(); }
+void InstructionSelector::VisitI32x4BitMask(Node* node) { UNIMPLEMENTED(); }
 // TODO(v8:10501) Prototyping pmin and pmax instructions.
 void InstructionSelector::VisitF32x4Pmin(Node* node) { UNIMPLEMENTED(); }
 void InstructionSelector::VisitF32x4Pmax(Node* node) { UNIMPLEMENTED(); }

src/wasm/wasm-opcodes.h

@@ -346,7 +346,6 @@ bool IsJSCompatibleSignature(const FunctionSig* sig, const WasmFeatures&);
   V(I8x16Neg, 0xfd61, s_s)                   \
   V(V8x16AnyTrue, 0xfd62, i_s)               \
   V(V8x16AllTrue, 0xfd63, i_s)               \
-  V(I8x16BitMask, 0xfd64, i_s)               \
   V(I8x16SConvertI16x8, 0xfd65, s_ss)        \
   V(I8x16UConvertI16x8, 0xfd66, s_ss)        \
   V(I8x16Shl, 0xfd6b, s_si)                  \
@@ -367,7 +366,6 @@ bool IsJSCompatibleSignature(const FunctionSig* sig, const WasmFeatures&);
   V(I16x8Neg, 0xfd81, s_s)                   \
   V(V16x8AnyTrue, 0xfd82, i_s)               \
   V(V16x8AllTrue, 0xfd83, i_s)               \
-  V(I16x8BitMask, 0xfd84, i_s)               \
   V(I16x8SConvertI32x4, 0xfd85, s_ss)        \
   V(I16x8UConvertI32x4, 0xfd86, s_ss)        \
   V(I16x8SConvertI8x16Low, 0xfd87, s_s)      \
@@ -393,7 +391,6 @@ bool IsJSCompatibleSignature(const FunctionSig* sig, const WasmFeatures&);
   V(I32x4Neg, 0xfda1, s_s)                   \
   V(V32x4AnyTrue, 0xfda2, i_s)               \
   V(V32x4AllTrue, 0xfda3, i_s)               \
-  V(I32x4BitMask, 0xfda4, i_s)               \
   V(I32x4SConvertI16x8Low, 0xfda7, s_s)      \
   V(I32x4SConvertI16x8High, 0xfda8, s_s)     \
   V(I32x4UConvertI16x8Low, 0xfda9, s_s)      \
@@ -444,6 +441,9 @@ bool IsJSCompatibleSignature(const FunctionSig* sig, const WasmFeatures&);
 
 #define FOREACH_SIMD_POST_MVP_OPCODE(V) \
   V(I8x16Mul, 0xfd75, s_ss)             \
+  V(I8x16BitMask, 0xfd64, i_s)          \
+  V(I16x8BitMask, 0xfd84, i_s)          \
+  V(I32x4BitMask, 0xfda4, i_s)          \
   V(V64x2AnyTrue, 0xfdc2, i_s)          \
   V(V64x2AllTrue, 0xfdc3, i_s)          \
   V(I64x2Eq, 0xfdc0, s_ss)              \

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

@@ -1645,7 +1645,10 @@ WASM_SIMD_TEST(I16x8ReplaceLane) {
   }
 }
 
+#if V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_IA32 || \
+    V8_TARGET_ARCH_X64
 WASM_SIMD_TEST_NO_LOWERING(I8x16BitMask) {
+  FLAG_SCOPE(wasm_simd_post_mvp);
   WasmRunner<int32_t, int32_t> r(execution_tier, lower_simd);
   byte value1 = r.AllocateLocal(kWasmS128);
 
@@ -1665,6 +1668,7 @@ WASM_SIMD_TEST_NO_LOWERING(I8x16BitMask) {
 }
 
 WASM_SIMD_TEST_NO_LOWERING(I16x8BitMask) {
+  FLAG_SCOPE(wasm_simd_post_mvp);
   WasmRunner<int32_t, int32_t> r(execution_tier, lower_simd);
   byte value1 = r.AllocateLocal(kWasmS128);
 
@@ -1684,6 +1688,7 @@ WASM_SIMD_TEST_NO_LOWERING(I16x8BitMask) {
 }
 
 WASM_SIMD_TEST_NO_LOWERING(I32x4BitMask) {
+  FLAG_SCOPE(wasm_simd_post_mvp);
   WasmRunner<int32_t, int32_t> r(execution_tier, lower_simd);
   byte value1 = r.AllocateLocal(kWasmS128);
 
@@ -1701,6 +1706,8 @@ WASM_SIMD_TEST_NO_LOWERING(I32x4BitMask) {
     CHECK_EQ(actual, expected);
   }
 }
+#endif  // V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_IA32 ||
+        // V8_TARGET_ARCH_X64
 
 WASM_SIMD_TEST(I8x16Splat) {
   WasmRunner<int32_t, int32_t> r(execution_tier, lower_simd);