add some precompile items to help Pkg.update speed

base/precompile.jl

@@ -256,3 +256,21 @@ precompile(take!, (RemoteValue,))
 precompile(write, (IOBuffer, Vector{Uint8}))
 precompile(repl_cmd, (Cmd,))
 precompile(run, (Cmd,))
+
+# The following are intended to help speed Pkg.update()
+precompile(Pkg.update, ())
+precompile(Pkg.Read.installed_version, (ASCIIString, Base.Dict{Base.VersionNumber, Base.Pkg.Types.Available}))
+precompile(Pkg.Git.attached,(Array{Any, 1},))
+precompile(spawn,(Base.Cmd,))
+precompile(spawn,(Base.Cmd, (Base.TTY, Base.TTY, Base.TTY), Bool, Bool))
+precompile(isempty,(Array{Void, 1},))
+precompile(Base.Sort.sort!, (Array{Any,1},))
+precompile(Base.Sort.sort!, (Array{Any, 1}, Base.Sort.MergeSortAlg, Base.Order.ForwardOrdering))
+precompile(Base.Sort.sort!,(Array{Any, 1}, Int64, Int64, Base.Sort.InsertionSortAlg, Base.Order.ForwardOrdering))
+precompile(Base.Sort.sort!,(Array{Base.VersionNumber, 1}, Int64, Int64, Base.Sort.InsertionSortAlg, Base.Order.ForwardOrdering))
+precompile(setindex!,(Dict{ByteString, VersionNumber}, VersionNumber, ASCIIString))
+precompile(info,(ASCIIString,))
+precompile(Pkg.Entry.update,(ASCIIString,))
+precompile(Pkg.Query.prune_dependencies, (Dict{ByteString, Pkg.Types.VersionSet}, Dict{ByteString, Dict{VersionNumber, Pkg.Types.Available}}))
+precompile(Pkg.Resolve.resolve,(Dict{ByteString,Pkg.Types.VersionSet}, Dict{ByteString, Dict{VersionNumber, Pkg.Types.Available}}))
+