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New function: SB-EXT:SPIN-LOOP-HINT

Some architectures have developed ways to help the processor execute
spin loops efficiently; expose them, where applicable, via
SB-EXT:SPIN-LOOP-HINT.

Assembles to PAUSE on x86oids, and to nothing on other platforms.

Paul Khuong Paul Khuong 2011-08-14

changed NEWS
changed package-data-list.lisp-expr
changed src
changed src/code
changed src/code/late-extensions.lisp
changed src/compiler
changed src/compiler/alpha
changed src/compiler/alpha/system.lisp
changed src/compiler/fndb.lisp
changed src/compiler/hppa
changed src/compiler/hppa/system.lisp
changed src/compiler/mips
changed src/compiler/mips/system.lisp
changed src/compiler/ppc
changed src/compiler/ppc/system.lisp
changed src/compiler/sparc
changed src/compiler/sparc/system.lisp
changed src/compiler/x86
changed src/compiler/x86-64
changed src/compiler/x86-64/system.lisp
changed src/compiler/x86/insts.lisp
changed src/compiler/x86/system.lisp
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