Expose SIMD.Float32x4 type to Javascript.

src/ppc/full-codegen-ppc.cc

Index: src/ppc/full-codegen-ppc.cc
diff --git a/src/ppc/full-codegen-ppc.cc b/src/ppc/full-codegen-ppc.cc
index ddb100c1971ba3f7676b2d8ba7ce16b97c054aaf..1582585083293887415739a1a4781857a6d1ae8f 100644
--- a/src/ppc/full-codegen-ppc.cc
+++ b/src/ppc/full-codegen-ppc.cc
@@ -5248,6 +5248,10 @@ void FullCodeGenerator::EmitLiteralCompareTypeof(Expression* expr,
     __ JumpIfSmi(r3, if_false);
     __ CompareObjectType(r3, r3, r4, SYMBOL_TYPE);
     Split(eq, if_true, if_false, fall_through);
+  } else if (String::Equals(check, factory->float32x4_string())) {
+    __ JumpIfSmi(r3, if_false);
+    __ CompareObjectType(r3, r3, r4, FLOAT32X4_TYPE);
+    Split(eq, if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->boolean_string())) {
     __ CompareRoot(r3, Heap::kTrueValueRootIndex);
     __ beq(if_true);