[Misc] Build fails after rebasing 8u232, fix it by porting 8202353 from upstream

Summary:
Port 8202353 from lastest jdk, in order to fix compatibility of 8u232 api change instead of the origin openjdk8 patch
Buglist ref: https://bugs.openjdk.java.net/browse/JDK-8202353
Fix ref: http://hg.openjdk.java.net/jdk/jdk/rev/f605c91e5219

Test Plan:
Successfully build Dragonwell8, and pass jfr tests.

Reviewed-by: D-D-H,luchsh,sanhong

Issue: https://github.com/alibaba/dragonwell8/issues/73

src/os/linux/vm/os_perf_linux.cpp

@@ -904,21 +904,14 @@ int SystemProcessInterface::SystemProcesses::ProcessIterator::current(SystemProc
 }
 
 int SystemProcessInterface::SystemProcesses::ProcessIterator::next_process() {
-  struct dirent* entry;
-
   if (!is_valid()) {
     return OS_ERR;
   }
 
   do {
-      entry = os::readdir(_dir, _entry);
-    if (entry == NULL) {
-      // error
-      _valid = false;
-      return OS_ERR;
-    }
+      _entry = os::readdir(_dir);
     if (_entry == NULL) {
-      // reached end
+      // Error or reached end.  Could use errno to distinguish those cases.
       _valid = false;
       return OS_ERR;
     }
@@ -935,11 +928,8 @@ SystemProcessInterface::SystemProcesses::ProcessIterator::ProcessIterator() {
 }
 
 bool SystemProcessInterface::SystemProcesses::ProcessIterator::initialize() {
-  _dir = opendir("/proc");
-  _entry = (struct dirent*)NEW_C_HEAP_ARRAY(char, sizeof(struct dirent) + NAME_MAX + 1, mtInternal);
-  if (NULL == _entry) {
-    return false;
-  }
+  _dir = os::opendir("/proc");
+  _entry = NULL;
   _valid = true;
   next_process();
 
@@ -947,11 +937,8 @@ bool SystemProcessInterface::SystemProcesses::ProcessIterator::initialize() {
 }
 
 SystemProcessInterface::SystemProcesses::ProcessIterator::~ProcessIterator() {
-  if (_entry != NULL) {
-    FREE_C_HEAP_ARRAY(char, _entry, mtInternal);
-  }
   if (_dir != NULL) {
-    closedir(_dir);
+    os::closedir(_dir);
   }
 }
 

src/share/vm/jfr/recorder/repository/jfrRepository.cpp

@@ -241,11 +241,7 @@ RepositoryIterator::RepositoryIterator(const char* repository, size_t repository
       return;
     }
     struct dirent* dentry;
-    char* dir_buffer = NEW_RESOURCE_ARRAY_RETURN_NULL(char, os::readdir_buf_size(_repo));
-    if (dir_buffer == NULL) {
-      return;
-    }
-    while ((dentry = os::readdir(dirp, (struct dirent*)dir_buffer)) != NULL) {
+    while ((dentry = os::readdir(dirp)) != NULL) {
       const char* const entry_path = filter(dentry->d_name);
       if (NULL != entry_path) {
         _files->append(entry_path);