implement compress option `reduce_funcs` (#2466)

- inline single-use function declarations as expressions when permissible
- depend on `reduce_vars`
- enabled by default
- disable for speed critical code

fixes #2464

1 files changed, 1 insertions, 0 deletions

diff --git a/test/compress/comparing.js b/test/compress/comparing.js
index 11804cbb..e374b585 100644
--- a/test/compress/comparing.js
+++ b/test/compress/comparing.js
@@ -96,6 +96,7 @@ self_comparison_1: {
 self_comparison_2: {
     options = {
         comparisons: true,
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
     }