[Bug-apl] Segfault in reshape

[Kacper Gutowski]

When used with negative shape as left argument and non-literal array
on the right, reshape dies with segmentation fault instead of raising
a DOMAIN ERROR.

      ¯1⍴0,0


====================================================
SEGMENTATION FAULT

----------------------------------------
-- Stack trace at main.cc:162
----------------------------------------
0x7fa4d3d4db45 __libc_start_main
0x43f205  main
0x57237d   Workspace::immediate_execution(bool)
0x48ad8a    Command::process_line()
0x480738     Command::do_APL_expression(UCS_string&)
0x49565b      Executable::execute_body() const
0x51f020       StateIndicator::run()
0x4c5a5c        Prefix::reduce_statements()
0x4c0b75         Prefix::reduce_A_F_B_()
0x4ccf2e          Bif_F12_RHO::eval_AB(Value_P, Value_P)
0x7fa4d59948d0           
0x4abf47            
========================================
====================================================


-k