fix #6179 (née #8828, non-specific error line number)

[nolta]

Possibly fix #6179 (née #8828).

$ cat test.jl
for i=1:10
    if false |           #Should error on line 2.
        continue
    end
end

julia> include("test.jl")
ERROR: unsupported or misplaced expression 'break' in function 'anonymous'
 in anonymous at no file:2
 in include at ./boot.jl:242
 in include_from_node1 at ./loading.jl:128
while loading /Users/nolta/julia/tt.jl, in expression starting on line 1

[nolta]

Looking at the code again, maybe i should replace emit_error with just_emit_error?

[nolta]

Bump -- this is a tiny little patch.