[wasm] Remove the ref.eq instruction again

The instruction got removed from the proposal.

R=titzer@chromium.org

Bug: v8:7581
Change-Id: I3e27bad923544896ebf6ab8969e5c365a397f6c9
Reviewed-on: https://chromium-review.googlesource.com/1128754Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54402}

src/wasm/wasm-opcodes.cc

@@ -107,7 +107,6 @@ const char* WasmOpcodes::OpcodeName(WasmOpcode opcode) {
     CASE_FLOAT_OP(CopySign, "copysign")
     CASE_REF_OP(Null, "null")
     CASE_REF_OP(IsNull, "is_null")
-    CASE_REF_OP(Eq, "eq")
     CASE_I32_OP(ConvertI64, "wrap/i64")
     CASE_CONVERT_OP(Convert, INT, F32, "f32", "trunc")
     CASE_CONVERT_OP(Convert, INT, F64, "f64", "trunc")
@@ -354,7 +353,6 @@ bool WasmOpcodes::IsAnyRefOpcode(WasmOpcode opcode) {
   switch (opcode) {
     case kExprRefNull:
     case kExprRefIsNull:
-    case kExprRefEq:
       return true;
     default:
       return false;

src/wasm/wasm-opcodes.h

@@ -226,8 +226,7 @@ using WasmName = Vector<const char>;
   V(I64SExtendI8, 0xc2, l_l)               \
   V(I64SExtendI16, 0xc3, l_l)              \
   V(I64SExtendI32, 0xc4, l_l)              \
-  V(RefIsNull, 0xd1, i_r)                  \
-  V(RefEq, 0xd2, i_rr)
+  V(RefIsNull, 0xd1, i_r)
 
 // For compatibility with Asm.js.
 #define FOREACH_ASMJS_COMPAT_OPCODE(V) \
@@ -535,8 +534,7 @@ using WasmName = Vector<const char>;
   V(l_il, kWasmI64, kWasmI32, kWasmI64)            \
   V(i_iii, kWasmI32, kWasmI32, kWasmI32, kWasmI32) \
   V(l_ill, kWasmI64, kWasmI32, kWasmI64, kWasmI64) \
-  V(i_r, kWasmI32, kWasmAnyRef)                    \
-  V(i_rr, kWasmI32, kWasmAnyRef, kWasmAnyRef)
+  V(i_r, kWasmI32, kWasmAnyRef)
 
 #define FOREACH_SIMD_SIGNATURE(V)          \
   V(s_s, kWasmS128, kWasmS128)             \

test/unittests/wasm/function-body-decoder-unittest.cc

@@ -2975,7 +2975,6 @@ TEST_F(WasmOpcodeLengthTest, SimpleExpressions) {
   EXPECT_LENGTH(1, kExprF64ReinterpretI64);
   EXPECT_LENGTH(1, kExprI32ReinterpretF32);
   EXPECT_LENGTH(1, kExprI64ReinterpretF64);
-  EXPECT_LENGTH(1, kExprRefEq);
 }
 
 TEST_F(WasmOpcodeLengthTest, SimdExpressions) {