Invalid pointer

[timholy]

This causes X on the arrayops tests.

julia> using JuliaInterpreter

julia> TT = Union{UInt8, Int8}
Union{Int8, UInt8}

julia> a = TT[0x0, 0x1]
2-element Array{Union{Int8, UInt8},1}:
 0x00
 0x01

julia> pa = pointer(a)
Ptr{Union{Int8, UInt8}} @0x00007fbf5c864950

julia> @interpret unsafe_store!(pa, 0x1, 2)
ERROR: pointerset: invalid pointer
Stacktrace:
 [1] maybe_evaluate_builtin(::JuliaStackFrame, ::Expr) at /home/tim/.julia/dev/JuliaInterpreter/src/builtins-julia1.1.jl:121
 [2] #evaluate_call!#9(::typeof(JuliaInterpreter.finish_and_return!), ::Function, ::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::Expr, ::JuliaInterpreter.JuliaProgramCounter) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:189
 [3] evaluate_call!(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::Expr, ::JuliaInterpreter.JuliaProgramCounter) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:180
 [4] eval_rhs(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::Expr, ::JuliaInterpreter.JuliaProgramCounter) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:315
 [5] _step_expr!(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::Any, ::JuliaInterpreter.JuliaProgramCounter, ::Bool) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:439
 [6] _step_expr!(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::JuliaInterpreter.JuliaProgramCounter, ::Bool) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:464
 [7] finish!(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::JuliaInterpreter.JuliaProgramCounter, ::Bool) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:507
 [8] finish_and_return!(::Array{JuliaStackFrame,1}, ::JuliaStackFrame, ::JuliaInterpreter.JuliaProgramCounter, ::Bool) at /home/tim/.julia/dev/JuliaInterpreter/src/interpret.jl:526 (repeats 3 times)
 [9] top-level scope at /home/tim/.julia/dev/JuliaInterpreter/src/JuliaInterpreter.jl:1063

[timholy]

JuliaLang/julia#31182