[wasm] Implement first set of SIMD I8x16 ops

src/compiler/x64/instruction-codes-x64.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_
 #define V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 159 matching lines @@
   V(X64I16x8Mul)                   \
   V(X64I16x8MinS)                  \
   V(X64I16x8MaxS)                  \
   V(X64I16x8Eq)                    \
   V(X64I16x8Ne)                    \
   V(X64I16x8ShrU)                  \
   V(X64I16x8AddSaturateU)          \
   V(X64I16x8SubSaturateU)          \
   V(X64I16x8MinU)                  \
   V(X64I16x8MaxU)                  \
+  V(X64I8x16Splat)                 \
+  V(X64I8x16ExtractLane)           \
+  V(X64I8x16ReplaceLane)           \
+  V(X64I8x16Add)                   \
+  V(X64I8x16AddSaturateS)          \
+  V(X64I8x16Sub)                   \
+  V(X64I8x16SubSaturateS)          \
+  V(X64I8x16MinS)                  \
+  V(X64I8x16MaxS)                  \
+  V(X64I8x16Eq)                    \
+  V(X64I8x16Ne)                    \
+  V(X64I8x16AddSaturateU)          \
+  V(X64I8x16SubSaturateU)          \
+  V(X64I8x16MinU)                  \
+  V(X64I8x16MaxU)                  \
   V(X64S128Select)                 \
   V(X64S128Zero)
 
 // Addressing modes represent the "shape" of inputs to an instruction.
 // Many instructions support multiple addressing modes. Addressing modes
 // are encoded into the InstructionCode of the instruction and tell the
 // code generator after register allocation which assembler method to call.
 //
 // We use the following local notation for addressing modes:
 //
@@ skipping 23 matching lines @@
   V(M8I)  /* [      %r2*8 + K] */      \
   V(Root) /* [%root       + K] */
 
 enum X64MemoryProtection { kUnprotected = 0, kProtected = 1 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_