LAPACK: Avoid repr call in chkvalidparam (JuliaLang#54952)

We were calling `repr` here to interpolate the character with the quotes
into the error message. However, this is overkill for this application,
and `repr` introduces dynamic dispatch into the call. This PR hard-codes
the quotes into the string, which matches the pattern followed in the
other error messages following `chkvalidparam`.

stdlib/LinearAlgebra/src/lapack.jl

@@ -61,9 +61,13 @@ macro chkvalidparam(position::Int, param, validvalues)
  :(chkvalidparam($position, $(string(param)), $(esc(param)), $validvalues))
 end
 function chkvalidparam(position::Int, var::String, val, validvals)
+ # mimic `repr` for chars without explicitly calling it
+ # This is because `repr` introduces dynamic dispatch
+ _repr(c::AbstractChar) = "'$c'"
+ _repr(c) = c
  if val ∉ validvals
  throw(ArgumentError(
- lazy"argument #$position: $var must be one of $validvals, but $(repr(val)) was passed"))
+ lazy"argument #$position: $var must be one of $validvals, but $(_repr(val)) was passed"))
  end
  return val
 end