restore line number filtering when inlining very small functions. helps

#13725

Single expression functions tend to get inlined into the middle of an
expression, so their line numbers should not be inserted into the outer function
(the number applies to only part of an expression, not the whole statement).

This also significantly reduces sysimg size.

base/inference.jl

@@ -2721,6 +2721,14 @@ function inlineable(f::ANY, e::Expr, atype::ANY, sv::StaticVarInfo, enclosing_as
         expr = lastexpr.args[1]
     end
 
+    if length(stmts) == 1
+        # remove line number when inlining a single expression. see issue #13725
+        s = stmts[1]
+        if isa(s,Expr)&&is(s.head,:line) || isa(s,LineNumberNode)
+            pop!(stmts)
+        end
+    end
+
     if isa(expr,Expr)
         old_t = e.typ
         if old_t <: expr.typ