Allow intrinsics to use #[fixed_stack_segment], and use it for numeric intrinsics#5975

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huonw wants to merge 3 commits intorust-lang:incomingfrom huonw:rustc-intrinsics-fixed-stack

+188-162

Commits on Apr 20, 2013

librustc: implement and use fixed_stack_segment attribute for intrinsics.
huonw
committed
librustc: use LLVM intrinsics for several floating point operations.
huonw
committed
testsuite: update tests to not use math intrinsics directly
huonw
committed