Revert 126715 - Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h

Index: third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h
===================================================================
--- third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h	(revision 126727)
+++ third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h	(working copy)
@@ -48,25 +48,11 @@
 // The x86-32 case and the x86-64 case differ:
 // 32b has a mmap2() syscall, 64b does not.
 // 64b and 32b have different calling conventions for mmap().
+#if defined(__i386__) || defined(__PPC__)
 
-// I test for 64-bit first so I don't have to do things like
-// '#if (defined(__mips__) && !defined(__MIPS64__))' as a mips32 check.
-#if defined(__x86_64__) || defined(__PPC64__) || (defined(_MIPS_SIM) && _MIPS_SIM == _ABI64)
-
 static inline void* do_mmap64(void *start, size_t length,
                               int prot, int flags,
                               int fd, __off64_t offset) __THROW {
-  return sys_mmap(start, length, prot, flags, fd, offset);
-}
-
-#define MALLOC_HOOK_HAVE_DO_MMAP64 1
-
-#elif defined(__i386__) || defined(__PPC__) || defined(__mips__) || \
-      defined(__arm__)
-
-static inline void* do_mmap64(void *start, size_t length,
-                              int prot, int flags,
-                              int fd, __off64_t offset) __THROW {
   void *result;
 
   // Try mmap2() unless it's not supported
@@ -99,28 +85,31 @@
     goto out;
   }
 
-#ifdef __NR_mmap
   {
     // Fall back to old 32-bit offset mmap() call
     // Old syscall interface cannot handle six args, so pass in an array
-    int32 args[6] = { (int32) start, (int32) length, prot, flags, fd,
-                      (off_t) offset };
+    int32 args[6] = { (int32) start, length, prot, flags, fd, (off_t) offset };
     result = (void *)syscall(SYS_mmap, args);
   }
-#else
-  // Some Linux ports like ARM EABI Linux has no mmap, just mmap2.
-  result = MAP_FAILED;
-#endif
-
  out:
   return result;
 }
 
 #define MALLOC_HOOK_HAVE_DO_MMAP64 1
 
-#endif  // #if defined(__x86_64__)
+#elif defined(__x86_64__) || defined(__PPC64__)  // #if defined(__i386__) || ...
 
+static inline void* do_mmap64(void *start, size_t length,
+                              int prot, int flags,
+                              int fd, __off64_t offset) __THROW {
+  return (void *)syscall(SYS_mmap, start, length, prot, flags, fd, offset);
+}
 
+#define MALLOC_HOOK_HAVE_DO_MMAP64 1
+
+#endif  // #if defined(__i386__) || defined(__PPC__)
+
+
 #ifdef MALLOC_HOOK_HAVE_DO_MMAP64
 
 // We use do_mmap64 abstraction to put MallocHook::InvokeMmapHook