samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/bug2.t

@@ -0,0 +1,20 @@
+ffi = require("ffi")
+cstdio = terralib.includec("stdio.h")
+
+local vec4 = &vector(float,4)
+
+local align = terralib.aligned 
+terra lol( w : &float, out : &float)
+  var a  = terralib.attrload(vec4(w),{align = 4})
+  terralib.attrstore(vec4(out), a, {align = 4})
+end
+
+dat = ffi.new("float[?]",32)
+for i=0,31 do dat[i]=i end
+datO = ffi.new("float[?]",32)
+
+lol:compile()
+lol:disas()
+
+lol(dat, datO)
+