Revert of Remove SIMD.js from V8.

src/crankshaft/s390/lithium-codegen-s390.cc

Index: src/crankshaft/s390/lithium-codegen-s390.cc
diff --git a/src/crankshaft/s390/lithium-codegen-s390.cc b/src/crankshaft/s390/lithium-codegen-s390.cc
index 8237161e85e0ff5156a2c20322d5472b4b6740cb..613f21ad2f472ec0a4c62db97893b25f5a96c4d9 100644
--- a/src/crankshaft/s390/lithium-codegen-s390.cc
+++ b/src/crankshaft/s390/lithium-codegen-s390.cc
@@ -2193,6 +2193,13 @@
         __ beq(instr->TrueLabel(chunk_));
       }
 
+      if (expected & ToBooleanHint::kSimdValue) {
+        // SIMD value -> true.
+        Label not_simd;
+        __ CompareInstanceType(map, ip, SIMD128_VALUE_TYPE);
+        __ beq(instr->TrueLabel(chunk_));
+      }
+
       if (expected & ToBooleanHint::kHeapNumber) {
         // heap number -> false iff +0, -0, or NaN.
         Label not_heap_number;
@@ -5352,6 +5359,17 @@
     __ CmpP(r0, Operand::Zero());
     final_branch_condition = eq;
 
+// clang-format off
+#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type)        \
+  } else if (String::Equals(type_name, factory->type##_string())) {  \
+    __ JumpIfSmi(input, false_label);                                \
+    __ LoadP(scratch, FieldMemOperand(input, HeapObject::kMapOffset)); \
+    __ CompareRoot(scratch, Heap::k##Type##MapRootIndex);            \
+    final_branch_condition = eq;
+  SIMD128_TYPES(SIMD128_TYPE)
+#undef SIMD128_TYPE
+    // clang-format on
+
   } else {
     __ b(false_label);
   }