Use -fspecialize-aggressively to improve performance by 30% on ACME build (purescript#4584)

* Use -fspecialize-aggressively to improve performance

* add fspecialize to cabal project

Author: seastian

cabal.project

@@ -2,6 +2,9 @@ packages:
   purescript.cabal
 
 source-repository-package
-   type: git
-   location: https://github.com/purescript/cheapskate.git
-   tag: 633c69024e061ad956f1aecfc137fb99a7a7a20b
+  type: git
+  location: https://github.com/purescript/cheapskate.git
+  tag: 633c69024e061ad956f1aecfc137fb99a7a7a20b
+
+package purescript
+  ghc-options: -fspecialize-aggressively -fexpose-all-unfoldings

stack.yaml

@@ -6,7 +6,7 @@ packages:
 - '.'
 ghc-options:
   # Build with advanced optimizations enabled by default
-  "$locals": -O2 -Werror
+  "$locals": -O2 -Werror -fspecialize-aggressively -fexpose-all-unfoldings
 extra-deps:
 # As of 2021-11-08, the latest release of `language-javascript` is 0.7.1.0,
 # but it has a problem with parsing the `async` keyword.  It doesn't allow