Add tests for the possibly gcc miscompile error of LLVM in the mandel…

… example.

numba/tests/issues/test_potential_gcc_error.py

@@ -0,0 +1,15 @@
+# This tests a potential GCC 4.1.2 miscompile of LLVM.
+# The problem is observed as a error in greedy register allocation pass,
+# which resulted as a segfault.
+# No such problem in GCC 4.4.6.
+
+
+from numba import *
+import numpy as np
+
+@jit(uint8[:,:](f8, f8, f8, f8, uint8[:,:], int32))
+def create_fractal(min_x, max_x, min_y, max_y, image, iters):
+    return image
+
+
+