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Author SHA1 Message Date
Evan Cheng
dea3347167 Be careful about scheduling nodes above previous calls. It increase usages of 
more callee-saved registers and introduce copies. Only allows it if scheduling
a node above calls would end up lessen register pressure.

Call operands also has added ABI restrictions for register allocation, so be
extra careful with hoisting them above calls.

rdar://9329627

llvm-svn: 130245
 2011-04-26 21:31:35 +00:00