Expose SIMD.Float32x4 type to Javascript.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index b7a7aee9175111b87275d84c1da5f336b29e28bf..a9edbb9ba338445e9c4a7e2c13d3f3ef0ff5395d 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -1926,6 +1926,12 @@ void LCodeGen::DoBranch(LBranch* instr) {
         __ B(eq, true_label);
       }
 
+      if (expected.Contains(ToBooleanStub::SIMD_VALUE)) {
+        // SIMD value -> true.
+        __ CompareInstanceType(map, scratch, FLOAT32X4_TYPE);
+        __ B(eq, true_label);
+      }
+
       if (expected.Contains(ToBooleanStub::HEAP_NUMBER)) {
         Label not_heap_number;
         __ JumpIfNotRoot(map, Heap::kHeapNumberMapRootIndex, &not_heap_number);
@@ -5962,6 +5968,15 @@ void LCodeGen::DoTypeofIsAndBranch(LTypeofIsAndBranch* instr) {
     __ Ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset));
     EmitTestAndBranch(instr, eq, scratch, 1 << Map::kIsUndetectable);
 
+  } else if (String::Equals(type_name, factory->float32x4_string())) {
+    DCHECK((instr->temp1() != NULL) && (instr->temp2() != NULL));
+    Register map = ToRegister(instr->temp1());
+    Register scratch = ToRegister(instr->temp2());
+
+    __ JumpIfSmi(value, false_label);
+    __ CompareObjectType(value, map, scratch, FLOAT32X4_TYPE);
+    EmitBranch(instr, eq);
+
   } else {
     __ B(false_label);
   }