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[AArch64] Add command-line option predres

Authored by dnsampaio on Jan 4 2019, 3:04 AM.

Description

[AArch64] Add command-line option predres

Prediction control instructions are only
mandatory from v8.5a onwards but is optional
from Armv8.0-A. This patch adds a command
line option to enable it by it's own.

Differential Revision: https://reviews.llvm.org/D56007

llvm-svn: 350385