Define vector_any in coreimg.

This enables calls to kwarg functions before Base is defined
(eg. in inference), as the frontend generates a call to vector_any.

(cherry picked from commit 95c26b5)
ref #18396

Add a test for #18396.

Call a kwarg function in Core.Inference where vector_any was unavailable.

(cherry picked from commit fab9560)

Author: maleadt

base/base.jl

@@ -145,16 +145,6 @@ finalize(o::ANY) = ccall(:jl_finalize_th, Void, (Ptr{Void}, Any,),
 gc(full::Bool=true) = ccall(:jl_gc_collect, Void, (Cint,), full)
 gc_enable(on::Bool) = ccall(:jl_gc_enable, Cint, (Cint,), on)!=0
 
-# used by interpolating quote and some other things in the front end
-function vector_any(xs::ANY...)
-    n = length(xs)
-    a = Array{Any}(n)
-    @inbounds for i = 1:n
-        arrayset(a,xs[i],i)
-    end
-    a
-end
-
 immutable Nullable{T}
     isnull::Bool
     value::T

base/essentials.jl

@@ -209,3 +209,13 @@ const (:) = Colon()
 # For passing constants through type inference
 immutable Val{T}
 end
+
+# used by interpolating quote and some other things in the front end
+function vector_any(xs::ANY...)
+    n = length(xs)
+    a = Array{Any}(n)
+    @inbounds for i = 1:n
+        Core.arrayset(a,xs[i],i)
+    end
+    a
+end

test/keywordargs.jl

@@ -218,3 +218,10 @@ end
 @test f9948(x=5) == 5
 @test_throws UndefVarError f9948()
 @test getx9948() == 3
+
+# pr #18396, kwargs before Base is defined
+eval(Core.Inference, quote
+    f18396(;kwargs...) = g18396(;kwargs...)
+    g18396(;x=1,y=2) = x+y
+end)
+@test Core.Inference.f18396() == 3