[wasm-relaxed-simd][liftoff] Enable relaxed LaneSelect on Arm/Arm64

Bug: v8:12284
Change-Id: Ica2564e8b34f8edd9492ef379cf3a3eb5575633d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3642948
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80504}

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

@@ -2470,7 +2470,7 @@ void LiftoffAssembler::emit_s128_relaxed_laneselect(LiftoffRegister dst,
                                                     LiftoffRegister src1,
                                                     LiftoffRegister src2,
                                                     LiftoffRegister mask) {
-  bailout(kSimd, "emit_s128_relaxed_laneselect");
+  emit_s128_select(dst, src1, src2, mask);
 }
 
 void LiftoffAssembler::emit_f64x2_splat(LiftoffRegister dst,

src/wasm/baseline/arm64/liftoff-assembler-arm64.h

@@ -1785,7 +1785,7 @@ void LiftoffAssembler::emit_s128_relaxed_laneselect(LiftoffRegister dst,
                                                     LiftoffRegister src1,
                                                     LiftoffRegister src2,
                                                     LiftoffRegister mask) {
-  bailout(kSimd, "emit_s128_relaxed_laneselect");
+  emit_s128_select(dst, src1, src2, mask);
 }
 
 void LiftoffAssembler::emit_f64x2_splat(LiftoffRegister dst,

src/wasm/baseline/liftoff-compiler.cc

@@ -3484,7 +3484,8 @@ class LiftoffCompiler {
     LiftoffRegister mask = pinned.set(__ PopToRegister(pinned));
     LiftoffRegister src2 = pinned.set(__ PopToRegister(pinned));
     LiftoffRegister src1 = pinned.set(__ PopToRegister(pinned));
-    LiftoffRegister dst = __ GetUnusedRegister(RegClass::kFpReg, {}, pinned);
+    LiftoffRegister dst =
+        __ GetUnusedRegister(reg_class_for(kS128), {}, pinned);
     EmitTerOp<kS128, kS128>(&LiftoffAssembler::emit_s128_relaxed_laneselect,
                             dst, src1, src2, mask);
   }

test/cctest/cctest.status

@@ -1193,10 +1193,6 @@
 
 ['arch != ia32 and arch != x64', {
   # TODO(12284): Implement relaxed SIMD in Liftoff on missing architectures.
-  'test-run-wasm-relaxed-simd/RunWasm_I8x16RelaxedLaneSelect_liftoff': [SKIP],
-  'test-run-wasm-relaxed-simd/RunWasm_I16x8RelaxedLaneSelect_liftoff': [SKIP],
-  'test-run-wasm-relaxed-simd/RunWasm_I32x4RelaxedLaneSelect_liftoff': [SKIP],
-  'test-run-wasm-relaxed-simd/RunWasm_I64x2RelaxedLaneSelect_liftoff': [SKIP],
   'test-run-wasm-relaxed-simd/RunWasm_F32x4Qfma_liftoff': [SKIP],
   'test-run-wasm-relaxed-simd/RunWasm_F32x4Qfms_liftoff': [SKIP],
   'test-run-wasm-relaxed-simd/RunWasm_F64x2Qfma_liftoff': [SKIP],