auto merge of #6237 : dotdash/rust/reduce_bloat, r=brson
In commit d7f5e437 "core::rt: Add the local heap to newsched tasks", local_malloc and local_free have become rather big and their forced inlining causes quite a bit of code bloat. Compile times for crates affected by the bloat (e.g. rustc) improve, while others (e.g. libstd) seem to be unaffected, so I guess the inlining doesn't gain us much. Sizes: ``` | librustc | libsytax ---------------|–-----------|------------ with inlining | 18,547,824 | 7,110,848 w/o inlining | 15,092,040 | 5,518,608
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