[wasm-simd] Move i64x2.eq out of post mvp

This is merged into the proposal:
https://github.com/WebAssembly/simd/issues/419#issuecomment-765675472.

Bug: v8:11215
Change-Id: Ibe37c4f8a977ab9af1cc2dd083f1ebb88b27acfa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2647986Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72333}

src/compiler/backend/instruction-selector.cc

@@ -2751,14 +2751,6 @@ void InstructionSelector::VisitF32x4Qfms(Node* node) { UNIMPLEMENTED(); }
 #endif  // !V8_TARGET_ARCH_ARM64
 #endif  // !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_S390X
 
-#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_S390X && !V8_TARGET_ARCH_ARM64 && \
-    !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_MIPS64 && \
-    !V8_TARGET_ARCH_MIPS
-void InstructionSelector::VisitI64x2Eq(Node* node) { UNIMPLEMENTED(); }
-#endif  // !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_S390X && !V8_TARGET_ARCH_ARM64
-        // && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_ARM
-        // && !V8_TARGET_ARCH_MIPS64 && !V8_TARGET_ARCH_MIPS
-
 #if !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32
 // TODO(v8:11168): Prototyping prefetch.
 void InstructionSelector::VisitPrefetchTemporal(Node* node) { UNIMPLEMENTED(); }

src/wasm/wasm-opcodes.h

@@ -337,6 +337,7 @@ bool V8_EXPORT_PRIVATE IsJSCompatibleSignature(const FunctionSig* sig,
   V(I32x4LeU, 0xfd3e, s_ss)                  \
   V(I32x4GeS, 0xfd3f, s_ss)                  \
   V(I32x4GeU, 0xfd40, s_ss)                  \
+  V(I64x2Eq, 0xfdc0, s_ss)                   \
   V(F32x4Eq, 0xfd41, s_ss)                   \
   V(F32x4Ne, 0xfd42, s_ss)                   \
   V(F32x4Lt, 0xfd43, s_ss)                   \
@@ -505,7 +506,6 @@ bool V8_EXPORT_PRIVATE IsJSCompatibleSignature(const FunctionSig* sig,
   V(I32x4ExtAddPairwiseI16x8U, 0xfda6, s_s) \
   V(I16x8ExtAddPairwiseI8x16S, 0xfdc2, s_s) \
   V(I16x8ExtAddPairwiseI8x16U, 0xfdc3, s_s) \
-  V(I64x2Eq, 0xfdc0, s_ss)                  \
   V(F32x4Qfma, 0xfdb4, s_sss)               \
   V(F32x4Qfms, 0xfdd4, s_sss)               \
   V(F64x2Qfma, 0xfdfe, s_sss)               \

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

@@ -1004,7 +1004,6 @@ WASM_SIMD_TEST(I64x2ShrU) {
 
 void RunI64x2BinOpTest(TestExecutionTier execution_tier, LowerSimd lower_simd,
                        WasmOpcode opcode, Int64BinOp expected_op) {
-  FLAG_SCOPE(wasm_simd_post_mvp);
   WasmRunner<int32_t, int64_t, int64_t> r(execution_tier, lower_simd);
   // Global to hold output.
   int64_t* g = r.builder().AddGlobal<int64_t>(kWasmS128);
@@ -1039,15 +1038,9 @@ WASM_SIMD_TEST(I64x2Sub) {
                     base::SubWithWraparound);
 }
 
-#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_S390X || \
-    V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS64 || \
-    V8_TARGET_ARCH_MIPS
 WASM_SIMD_TEST_NO_LOWERING(I64x2Eq) {
   RunI64x2BinOpTest(execution_tier, lower_simd, kExprI64x2Eq, Equal);
 }
-#endif  // V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_S390X ||
-        // V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS64 ||
-        // V8_TARGET_ARCH_MIPS
 
 WASM_SIMD_TEST(F64x2Splat) {
   WasmRunner<int32_t, double> r(execution_tier, lower_simd);