Revert 41938 - Merged third_party/tcmalloc/vendor/src(googleperftools r87) in...

third_party/tcmalloc/chromium/src/windows/port.cc

Index: third_party/tcmalloc/chromium/src/windows/port.cc
===================================================================
--- third_party/tcmalloc/chromium/src/windows/port.cc	(revision 41940)
+++ third_party/tcmalloc/chromium/src/windows/port.cc	(working copy)
@@ -183,10 +183,13 @@
 // -----------------------------------------------------------------------
 // These functions replace system-alloc.cc
 
+static SpinLock alloc_lock(SpinLock::LINKER_INITIALIZED);
+
 // This is mostly like MmapSysAllocator::Alloc, except it does these weird
 // munmap's in the middle of the page, which is forbidden in windows.
 extern void* TCMalloc_SystemAlloc(size_t size, size_t *actual_size,
                                   size_t alignment) {
+  SpinLockHolder sh(&alloc_lock);
   // Align on the pagesize boundary
   const int pagesize = getpagesize();
   if (alignment < pagesize) alignment = pagesize;