Reland "always optimize third_party code"

This is a reland of c766370d86

Original change's description:
> always optimize third_party code
> 
> Change-Id: I5b2244460a4760e9336640f597d0f74c374a0d04
> Reviewed-on: https://skia-review.googlesource.com/155641
> Commit-Queue: Mike Klein <mtklein@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Auto-Submit: Mike Klein <mtklein@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

Change-Id: I63e7f9ca852fc99728d7a01d9987b3506115d266
Reviewed-on: https://skia-review.googlesource.com/155760
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

gn/BUILD.gn

@@ -455,7 +455,7 @@ config("no_rtti") {
   }
 }
 
-config("release") {
+config("optimize") {
   if (is_win) {
     cflags = [
       "/O2",
@@ -484,6 +484,9 @@ config("release") {
       ldflags += [ "-O3" ]
     }
   }
+}
+
+config("NDEBUG") {
   defines = [ "NDEBUG" ]
 }
 

gn/BUILDCONFIG.gn

@@ -218,7 +218,10 @@ default_configs = [
   "//gn:no_rtti",
 ]
 if (!is_debug) {
-  default_configs += [ "//gn:release" ]
+  default_configs += [
+    "//gn:optimize",
+    "//gn:NDEBUG",
+  ]
 }
 if (!is_official_build) {
   default_configs += [

third_party/third_party.gni

@@ -46,6 +46,9 @@ set_defaults("third_party") {
     # Official builds don't have warnings to begin with.
     configs -= [ "//gn:warnings" ]
   }
+  if (is_debug) {
+    configs += [ "//gn:optimize" ]
+  }
 }
 
 template("system") {