Merge pull request #14754 from JuliaLang/ob/arraylen-inlining

arraylen is not affect-free

Author: vtjnash

base/inference.jl

@@ -2223,7 +2223,7 @@ function effect_free(e::ANY, sv, allow_volatile::Bool)
         if e.head === :call
             if is_known_call_p(e, is_pure_builtin, sv)
                 if !allow_volatile
-                    if is_known_call(e, arrayref, sv)
+                    if is_known_call(e, arrayref, sv) || is_known_call(e, arraylen, sv)
                         return false
                     elseif is_known_call(e, getfield, sv)
                         # arguments must be immutable to ensure e is affect_free

test/core.jl

@@ -3651,3 +3651,7 @@ end
 # issue #14691
 type T14691; a::UInt; end
 @test (T14691(0).a = 0) === 0
+
+# issue #14245
+f14245() = (v = []; push!(v, length(v)); v)
+@test f14245()[1] == 0