[NeonIntrinsicTestEmitter] Add requirement to arm neon intrinsic tests for the feature long_tests.

This will prevent the tests from running on normal make check. You will need to
actually pass in --param run_long_tests=true to LIT in order to run these.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184784 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/NeonEmitter.cpp b/utils/TableGen/NeonEmitter.cpp
index 05505c9..23f4ee1 100644
--- a/utils/TableGen/NeonEmitter.cpp
+++ b/utils/TableGen/NeonEmitter.cpp
@@ -2230,6 +2230,8 @@
     "// RUN:  -target-cpu swift -ffreestanding -Os -S -o - %s\\\n"
     "// RUN:  | FileCheck %s\n"
     "\n"
+    "// REQUIRES: long_tests\n"
+    "\n"
     "#include <arm_neon.h>\n"
     "\n";