Commit [ce118e] Maximize Restore History

Microoptimisation for block headers on x86-64

Only emit a jmp over the header if a predecessor falls through to
the current block, and it there is a trampoline. Otherwise, it's
not worth the cost of a branch to skip a few NOPs.

Paul Khuong Paul Khuong 2011-06-23

changed src
changed src/compiler
changed src/compiler/x86-64
changed src/compiler/x86-64/call.lisp
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