ssa: fix wrong reflect type of closure

[cpunion]

Fix #864 (call closure failed)

Fix #832 (wrong reflect type of closure):

➜  llgo git:(fix-closure) ✗ go run ./_demo/reflectfunc
func(int, int) int
func
func(int, int) int
func
➜  llgo git:(fix-closure) ✗ go run ./cmd/llgo run ./_demo/reflectfunc
# github.com/goplus/llgo/cmd/llgo
ld: warning: -ld_classic is deprecated and will be removed in a future release
func(...)
func
func(...)
func

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.53%. Comparing base (e042aad) to head (252f3f0).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #874   +/-   ##
=======================================
  Coverage   95.53%   95.53%           
=======================================
  Files          22       22           
  Lines        6230     6233    +3     
=======================================
+ Hits         5952     5955    +3     
  Misses        246      246           
  Partials       32       32           

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