ff1c630edc
In the CPS backend's type propagation, try to avoid eliminating calls whose receiver can be null. This fixes a bug in the constant folding of indexed access. e0[e1] would be folded away if e0 could be null but type inference told us that the elements had a known (specifically null) type. tests/language/inference_list_or_null_test triggers the bug. R=asgerf@google.com BUG= Review URL: https://codereview.chromium.org/1515833003 .