[mips][wasm-simd][liftoff] Implement i16x8.splat

Port 59e96890 https://crrev.com/c/2036739

Change-Id: Ie90aa9afffe36938a97b06947db136dda7e2b840
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2063194
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Auto-Submit: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66328}

src/wasm/baseline/mips/liftoff-assembler-mips.h

@@ -1522,7 +1522,7 @@ void LiftoffAssembler::emit_f32x4_splat(LiftoffRegister dst,
   // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
   // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
   // 3a4000 support MSA.
-  bailout(kUnsupportedArchitecture, "emit_f32x4_splat");
+  bailout(kSimd, "emit_f32x4_splat");
 }
 
 void LiftoffAssembler::emit_i32x4_splat(LiftoffRegister dst,
@@ -1530,7 +1530,15 @@ void LiftoffAssembler::emit_i32x4_splat(LiftoffRegister dst,
   // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
   // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
   // 3a4000 support MSA.
-  bailout(kUnsupportedArchitecture, "emit_i32x4_splat");
+  bailout(kSimd, "emit_i32x4_splat");
+}
+
+void LiftoffAssembler::emit_i16x8_splat(LiftoffRegister dst,
+                                        LiftoffRegister src) {
+  // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
+  // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
+  // 3a4000 support MSA.
+  bailout(kSimd, "emit_i16x8_splat");
 }
 
 void LiftoffAssembler::StackCheck(Label* ool_code, Register limit_address) {

src/wasm/baseline/mips64/liftoff-assembler-mips64.h

@@ -1314,7 +1314,7 @@ void LiftoffAssembler::emit_f32x4_splat(LiftoffRegister dst,
   // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
   // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
   // 3a4000 support MSA.
-  bailout(kUnsupportedArchitecture, "emit_f32x4_splat");
+  bailout(kSimd, "emit_f32x4_splat");
 }
 
 void LiftoffAssembler::emit_i32x4_splat(LiftoffRegister dst,
@@ -1322,7 +1322,15 @@ void LiftoffAssembler::emit_i32x4_splat(LiftoffRegister dst,
   // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
   // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
   // 3a4000 support MSA.
-  bailout(kUnsupportedArchitecture, "emit_i32x4_splat");
+  bailout(kSimd, "emit_i32x4_splat");
+}
+
+void LiftoffAssembler::emit_i16x8_splat(LiftoffRegister dst,
+                                        LiftoffRegister src) {
+  // TODO(mips): Support this on loongson 3a4000. Currently, the main MIPS
+  // CPU, Loongson 3a3000 does not support MSA(simd128), but the upcoming
+  // 3a4000 support MSA.
+  bailout(kSimd, "emit_i16x8_splat");
 }
 
 void LiftoffAssembler::StackCheck(Label* ool_code, Register limit_address) {