Split folly/Memory out from headers-only targets

Reviewed By: yfeldblum

Differential Revision: D6732464

fbshipit-source-id: 9d9498e0faa02c2003ab0e363444b7a2be51fd93

Author: mzlee

ReactCommon/cxxreact/BUCK

@@ -54,6 +54,7 @@ rn_xplat_cxx_library(
     ],
     deps = [
         "xplat//folly:headers_only",
+        "xplat//folly:memory",
         "xplat//folly:molly",
         "xplat//folly:scope_guard",
     ],
@@ -75,6 +76,7 @@ rn_xplat_cxx_library(
     ],
     deps = [
         "xplat//folly:headers_only",
+        "xplat//folly:memory",
         "xplat//folly:molly",
         "xplat//third-party/glog:glog",
         ":module",
@@ -151,6 +153,7 @@ rn_xplat_cxx_library(
     deps = [
         "xplat//fbsystrace:fbsystrace",
         "xplat//folly:headers_only",
+        "xplat//folly:memory",
         "xplat//folly:molly",
         ":jsbigstring",
         ":module",