Add condition::Bool constraint to Base.ifelse

Co-authored-by: Jeff Bezanson <[email protected]>

base/essentials.jl

@@ -470,7 +470,7 @@ julia> ifelse(1 > 2, 1, 2)
 2
 ```
 """
-ifelse(condition, x, y) = Core.ifelse(condition, x, y)
+ifelse(condition::Bool, x, y) = Core.ifelse(condition, x, y)
 
 # simple Array{Any} operations needed for bootstrap
 @eval setindex!(A::Array{Any}, @nospecialize(x), i::Int) = arrayset($(Expr(:boundscheck)), A, x, i)