librustc: Remove all uses of `static` from functions. rs=destatic
libcore: Remove `pure` from libcore. rs=depure
libstd: Remove all uses of `pure` from libstd. rs=depure
test: Fix test. rs=test
librustc: Remove `pure` from libsyntax and librustc.
librustdoc: Remove `pure` from fuzzer and rustdoc.
test: Remove `pure` from the test suite
auto merge of #5488 : pcwalton/rust/depure, r=pcwalton