[NOT TO COMMIT!] Replace third_party/tcmalloc/chromium with tcmalloc r136 (the latest).

third_party/tcmalloc/chromium/src/base/sysinfo.cc

Index: third_party/tcmalloc/chromium/src/base/sysinfo.cc
diff --git a/third_party/tcmalloc/chromium/src/base/sysinfo.cc b/third_party/tcmalloc/chromium/src/base/sysinfo.cc
index 285630e3a9d0e85457d470dff5d74d1bd552949d..2559158b9db2585bb816e3019c429243eb7093ea 100644
--- a/third_party/tcmalloc/chromium/src/base/sysinfo.cc
+++ b/third_party/tcmalloc/chromium/src/base/sysinfo.cc
@@ -86,12 +86,20 @@
 // time, so prefer making the syscalls directly if we can.
 #ifdef HAVE_SYS_SYSCALL_H
 # include <sys/syscall.h>
+#endif
+#ifdef SYS_open   // solaris 11, at least sometimes, only defines SYS_openat
 # define safeopen(filename, mode)  syscall(SYS_open, filename, mode)
-# define saferead(fd, buffer, size)  syscall(SYS_read, fd, buffer, size)
-# define safeclose(fd)  syscall(SYS_close, fd)
 #else
 # define safeopen(filename, mode)  open(filename, mode)
+#endif
+#ifdef SYS_read
+# define saferead(fd, buffer, size)  syscall(SYS_read, fd, buffer, size)
+#else
 # define saferead(fd, buffer, size)  read(fd, buffer, size)
+#endif
+#ifdef SYS_close
+# define safeclose(fd)  syscall(SYS_close, fd)
+#else
 # define safeclose(fd)  close(fd)
 #endif
 
@@ -179,9 +187,6 @@ const char* GetenvBeforeMain(const char* name) {
 // in their first character!  If that assumption is violated, we'll
 // still get a profile, but one with an unexpected name.
 // TODO(csilvers): set an envvar instead when we can do it reliably.
-//
-// In Chromium this hack is intentionally disabled, because the path is not
-// re-initialized upon fork.
 bool GetUniquePathFromEnv(const char* env_name, char* path) {
   char* envval = getenv(env_name);
   if (envval == NULL || *envval == '\0')
@@ -191,9 +196,7 @@ bool GetUniquePathFromEnv(const char* env_name, char* path) {
              envval[0] & 127, envval+1, (unsigned int)(getpid()));
   } else {
     snprintf(path, PATH_MAX, "%s", envval);
-#if 0
     envval[0] |= 128;                     // set high bit for kids to see
-#endif
   }
   return true;
 }