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2015-01-26T21:17:14.690211Z
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Pull in r226664 from upstream llvm trunk (by Tim Northover):

  AArch64: add backend option to reserve x18 (platform register)

  AAPCS64 says that it's up to the platform to specify whether x18 is
  reserved, and a first step on that way is to add a flag controlling
  it.

  From: Andrew Turner <andrew@fubar.geek.nz>

Requested by:	andrew

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