[wasm-simd] Remove unused ir opcodes

S128Load and S128Store are not used, we create a node with Load/Store
opcode and store the appropriate LoadType/StoreType indicating this is a
128-bit type.

Bug: v8:11384
Change-Id: Ida4a36ab893637525cb827b659753ac90fcca743
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2760539Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73413}

src/compiler/machine-operator.cc

@@ -546,8 +546,6 @@ std::ostream& operator<<(std::ostream& os, TruncateKind kind) {
   V(I8x16Popcnt, Operator::kNoProperties, 1, 0, 1)                         \
   V(I8x16Abs, Operator::kNoProperties, 1, 0, 1)                            \
   V(I8x16BitMask, Operator::kNoProperties, 1, 0, 1)                        \
-  V(S128Load, Operator::kNoProperties, 2, 0, 1)                            \
-  V(S128Store, Operator::kNoProperties, 3, 0, 1)                           \
   V(S128Zero, Operator::kNoProperties, 0, 0, 1)                            \
   V(S128And, Operator::kAssociative | Operator::kCommutative, 2, 0, 1)     \
   V(S128Or, Operator::kAssociative | Operator::kCommutative, 2, 0, 1)      \

src/compiler/machine-operator.h

@@ -802,8 +802,6 @@ class V8_EXPORT_PRIVATE MachineOperatorBuilder final
   const Operator* I8x16Abs();
   const Operator* I8x16BitMask();
 
-  const Operator* S128Load();
-  const Operator* S128Store();
   const Operator* S128Const(const uint8_t value[16]);
 
   const Operator* S128Zero();

src/compiler/opcodes.h

@@ -963,8 +963,6 @@
   V(I8x16Popcnt)                \
   V(I8x16Abs)                   \
   V(I8x16BitMask)               \
-  V(S128Load)                   \
-  V(S128Store)                  \
   V(S128Zero)                   \
   V(S128Const)                  \
   V(S128Not)                    \