[LLDB] Attempt to fix DumpDataExtractorTest

This test was broken by 710276a because
DumpDataExtractor now accesses the Target properties, which someone ends
up relying on the file system.

This is an instance of this error https://lab.llvm.org/buildbot/#/builders/96/builds/45607/steps/6/logs/stdio

I cannot reproduce this locally, but it seems that the error happens
because we are not initializing the FileSystem and the Host as part of
the test setup.

lldb/unittests/Core/DumpDataExtractorTest.cpp

@@ -7,6 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Core/DumpDataExtractor.h"
+#include "lldb/Host/FileSystem.h"
+#include "lldb/Host/HostInfo.h"
 #include "lldb/Utility/DataBufferHeap.h"
 #include "lldb/Utility/DataExtractor.h"
 #include "lldb/Utility/Endian.h"
@@ -18,6 +20,20 @@
 using namespace lldb;
 using namespace lldb_private;
 
+// This is needed for the tests because they rely on the Target global
+// properties.
+class DumpDataExtractorTest : public ::testing::Test {
+public:
+  void SetUp() override {
+    FileSystem::Initialize();
+    HostInfo::Initialize();
+  }
+  void TearDown() override {
+    HostInfo::Terminate();
+    FileSystem::Terminate();
+  }
+};
+
 static void TestDumpWithAddress(uint64_t base_addr, size_t item_count,
                                 llvm::StringRef expected) {
   std::vector<uint8_t> data{0x11, 0x22};