tcmalloc: enable doubly-linked lists and disable huge allocations via build file

Moves the macro defines for enabling doubly-linked free lists and for disabling
huge allocations in tcmalloc to the build file. This makes it easier to uprev
tcmalloc from gperftools where these features are implemeneted, but not enabled
by default.

BUG=724399,b:70905156

Change-Id: Ie84407583227baeddeef6bcf5eb9a825dbc6ddd2
Reviewed-on: https://chromium-review.googlesource.com/1187381
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585623}

base/allocator/BUILD.gn

@@ -28,7 +28,10 @@ group("allocator") {
 }
 
 config("tcmalloc_flags") {
-  defines = []
+  defines = [
+    "TCMALLOC_USE_DOUBLYLINKED_FREELIST",
+    "TCMALLOC_DISABLE_HUGE_ALLOCATIONS",
+  ]
   if (enable_debugallocation) {
     defines += [
       # Use debugallocation for Debug builds to catch problems early

third_party/tcmalloc/chromium/src/free_list.h

@@ -44,9 +44,6 @@
 #include "linked_list.h"
 #include "system-alloc.h"
 
-// Remove to enable singly linked lists (the default for open source tcmalloc).
-#define TCMALLOC_USE_DOUBLYLINKED_FREELIST
-
 namespace tcmalloc {
 
 #if defined(TCMALLOC_USE_DOUBLYLINKED_FREELIST)

third_party/tcmalloc/chromium/src/tcmalloc.cc

@@ -135,9 +135,6 @@
 
 #include "maybe_emergency_malloc.h"
 
-// Remove to enable huge allocations (> 2GB), the default for gperftools.
-#define TCMALLOC_DISABLE_HUGE_ALLOCATIONS
-
 #if (defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)) && !defined(WIN32_OVERRIDE_ALLOCATORS)
 # define WIN32_DO_PATCHING 1
 #endif

third_party/tcmalloc/gperftools-2.0/chromium/src/free_list.h

@@ -44,9 +44,6 @@
 #include "linked_list.h"
 #include "system-alloc.h"
 
-// Remove to enable singly linked lists (the default for open source tcmalloc).
-#define TCMALLOC_USE_DOUBLYLINKED_FREELIST
-
 namespace tcmalloc {
 
 #if defined(TCMALLOC_USE_DOUBLYLINKED_FREELIST)