Expose SIMD.Float32x4 type to Javascript.

src/arm64/full-codegen-arm64.cc

Index: src/arm64/full-codegen-arm64.cc
diff --git a/src/arm64/full-codegen-arm64.cc b/src/arm64/full-codegen-arm64.cc
index 9896771b5813ea3a5b57749c8db9cba5ca714074..777aba121d17393f7ca459ee73f77838cef55825 100644
--- a/src/arm64/full-codegen-arm64.cc
+++ b/src/arm64/full-codegen-arm64.cc
@@ -4891,6 +4891,12 @@ void FullCodeGenerator::EmitLiteralCompareTypeof(Expression* expr,
     __ JumpIfSmi(x0, if_false);
     __ CompareObjectType(x0, x0, x1, SYMBOL_TYPE);
     Split(eq, if_true, if_false, fall_through);
+  } else if (String::Equals(check, factory->float32x4_string())) {
+    ASM_LOCATION(
+        "FullCodeGenerator::EmitLiteralCompareTypeof float32x4_string");
+    __ JumpIfSmi(x0, if_false);
+    __ CompareObjectType(x0, x0, x1, FLOAT32X4_TYPE);
+    Split(eq, if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->boolean_string())) {
     ASM_LOCATION("FullCodeGenerator::EmitLiteralCompareTypeof boolean_string");
     __ JumpIfRoot(x0, Heap::kTrueValueRootIndex, if_true);