[CodeView][Test] Fix module build by removing unused header

[steven_wu]

Summary

Remove unnecessary header from CodeView unittest. The unused PDB header
include has a dependency on Object -> Bitcode -> intrinsics_gen, which
will fail the module build because the module needed to build the tests
rely on the intrinsics gen.

llvm/unittests/DebugInfo/CodeView/RandomAccessVisitorTest.cpp

 //===- llvm/unittest/DebugInfo/CodeView/RandomAccessVisitorTest.cpp -------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/CodeView/AppendingTypeTableBuilder.h"
 #include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
 #include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
 #include "llvm/DebugInfo/CodeView/TypeRecord.h"
 #include "llvm/DebugInfo/CodeView/TypeRecordMapping.h"
 #include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
-#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/BinaryByteStream.h"
 #include "llvm/Support/BinaryItemStream.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Testing/Support/Error.h"
 
 #include "gtest/gtest.h"
 
 using namespace llvm;
 using namespace llvm::codeview;
-using namespace llvm::pdb;
 
 namespace llvm {
 namespace codeview {
 inline bool operator==(const ArrayRecord &R1, const ArrayRecord &R2) {
   if (R1.ElementType != R2.ElementType)
     return false;
   if (R1.IndexType != R2.IndexType)
     return false;