Switch to use the frozen stdx-allocator

.gitmodules

@@ -10,4 +10,7 @@
 	branch = master
 [submodule "dsymbol"]
 	path = dsymbol
-	url = https://github.com/dlang-community/dsymbol.git
+	url = https://github.com/dlang-community/dsymbol.git
+[submodule "stdx-allocator"]
+	path = stdx-allocator
+	url = https://github.com/dlang-community/stdx-allocator

dub.json

@@ -7,9 +7,10 @@
   ],
   "license": "GPL-3.0",
   "dependencies": {
-    "dsymbol": "~>0.3.0-alpha.1",
+    "dsymbol": "~>0.3.0-alpha.2",
     "libdparse": "~>0.8.0-alpha.3",
-    "msgpack-d": "~>1.0.0-beta.3"
+    "msgpack-d": "~>1.0.0-beta.3",
+    "stdx-allocator": "~>2.077.0"
   },
   "versions": ["built_with_dub"],
   "configurations": [

src/dcd/server/autocomplete/util.d

@@ -19,7 +19,7 @@
 module dcd.server.autocomplete.util;
 
 import std.algorithm;
-import std.experimental.allocator;
+import stdx.allocator;
 import std.experimental.logger;
 import std.range;
 import std.string;

src/dcd/server/main.d

@@ -24,8 +24,8 @@ import std.array;
 import std.conv;
 import std.datetime.stopwatch : AutoStart, StopWatch;
 import std.exception : enforce;
-import std.experimental.allocator;
-import std.experimental.allocator.mallocator;
+import stdx.allocator;
+import stdx.allocator.mallocator;
 import std.experimental.logger;
 import std.file;
 import std.getopt;

stdx-allocator

@@ -0,0 +1 @@
+Subproject commit 7487970b58f4a2c0d495679329a8a2857111f3fd