Fix warning
Fix ambiguous symbol resolution with libc++
Fixed crash when attempting to split a previously fused RVar.
Fixed bug due in previous commit, Split::exact is irrelevant for fuses.
std::cout -> printf.
Merge pull request #466 from halide/rvar-scheduling

Rvar scheduling
Fixed missing RDom name from introspection.
Fixed expr_uses_var to not return true when a Let defines the var being tested for use of.
Added bounds for the inner loop of a split RVar.
Added test for bounds inference of split RVars.
Added bounds lets for RVar splits in the correct order.
Enabled reordering test.
Merge branch 'rvar-bounds' into split-rvar-fix

Conflicts:
	src/Lower.cpp