ssa: fix const for named string

[visualfc]

fix const type for named string

type T string
var v any = T("hello")
println(v.(T)) // panic: type assertion failed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.64%. Comparing base (a05bda9) to head (eaf7e56).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #917   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files          22       22           
  Lines        6279     6289   +10     
=======================================
+ Hits         6131     6141   +10     
  Misses        128      128           
  Partials       20       20           

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