Revert of Expose SIMD.Float32x4 type to Javascript.

src/mips64/full-codegen-mips64.cc

Index: src/mips64/full-codegen-mips64.cc
diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc
index d4606ed2055968db9d12a8e72145cface610e760..ebd9abe813f664a6142dba9ba9fb57fe5951be25 100644
--- a/src/mips64/full-codegen-mips64.cc
+++ b/src/mips64/full-codegen-mips64.cc
@@ -5258,10 +5258,6 @@
     __ JumpIfSmi(v0, if_false);
     __ GetObjectType(v0, v0, a1);
     Split(eq, a1, Operand(SYMBOL_TYPE), if_true, if_false, fall_through);
-  } else if (String::Equals(check, factory->float32x4_string())) {
-    __ JumpIfSmi(v0, if_false);
-    __ GetObjectType(v0, v0, a1);
-    Split(eq, a1, Operand(FLOAT32X4_TYPE), if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->boolean_string())) {
     __ LoadRoot(at, Heap::kTrueValueRootIndex);
     __ Branch(if_true, eq, v0, Operand(at));