a-rate signals leak to instant control structures

[anton-k]

In the instant control stractures we can not use a-rates. So we force all the components to become k-rate. But conversion is pure and can be placed anywhere (in theory). but in practice it have to be placed before instant controls like:

if (smth happens) then
  ...
else
 ...
endif

Sometimes in the generated code a2k-rate conversions leak in the branches.

if (smth happens) then
  ...
  kr11 = ar12
  ....
else
 ...
endif

They should be rendered before the if-statement