Expose SIMD.Float32x4 type to Javascript.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index c56206a9ea899a80dfec0fa8b0c66d2a0dd449b4..d63338201845f93fc8fa2900082855052af659b6 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -2268,6 +2268,12 @@ void LCodeGen::DoBranch(LBranch* instr) {
         __ b(eq, instr->TrueLabel(chunk_));
       }
 
+      if (expected.Contains(ToBooleanStub::SIMD_VALUE)) {
+        // SIMD value -> true.
+        __ CompareInstanceType(map, ip, FLOAT32X4_TYPE);
+        __ b(eq, instr->TrueLabel(chunk_));
+      }
+
       if (expected.Contains(ToBooleanStub::HEAP_NUMBER)) {
         // heap number -> false iff +0, -0, or NaN.
         DwVfpRegister dbl_scratch = double_scratch0();
@@ -5681,6 +5687,11 @@ Condition LCodeGen::EmitTypeofIs(Label* true_label,
     __ tst(scratch, Operand(1 << Map::kIsUndetectable));
     final_branch_condition = eq;
 
+  } else if (String::Equals(type_name, factory->float32x4_string())) {
+    __ JumpIfSmi(input, false_label);
+    __ CompareObjectType(input, scratch, no_reg, FLOAT32X4_TYPE);
+    final_branch_condition = eq;
+
   } else {
     __ b(false_label);
   }