Change one(T) => T(1)

* This file is compiled early during bootstrap, and `one` is not yet
  available

base/sort.jl

@@ -171,7 +171,7 @@ partialsort(v::AbstractVector, k::Union{Int,OrdinalRange}; kws...) =
 # index of the first value of vector a that is greater than or equal to x;
 # returns length(v)+1 if x is greater than all values in v.
 function searchsortedfirst(v::AbstractVector, x, lo::T, hi::T, o::Ordering) where T<:Integer
-    u = one(T)
+    u = T(1)
     lo = lo - u
     hi = hi + u
     @inbounds while lo < hi - u
@@ -188,7 +188,7 @@ end
 # index of the last value of vector a that is less than or equal to x;
 # returns 0 if x is less than all values of v.
 function searchsortedlast(v::AbstractVector, x, lo::T, hi::T, o::Ordering) where T<:Integer
-    u = one(T)
+    u = T(1)
     lo = lo - u
     hi = hi + u
     @inbounds while lo < hi - u
@@ -206,7 +206,7 @@ end
 # if v does not contain x, returns a 0-length range
 # indicating the insertion point of x
 function searchsorted(v::AbstractVector, x, ilo::T, ihi::T, o::Ordering) where T<:Integer
-    u = one(T)
+    u = T(1)
     lo = ilo - u
     hi = ihi + u
     @inbounds while lo < hi - u