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[FastISel][AArch64] Make use of the zero register when possible.

Description

[FastISel][AArch64] Make use of the zero register when possible.

This change materializes now the value "0" from the zero register.
The zero register can be folded by several instruction, so no
materialization is need at all.

Fixes rdar://problem/17924413.

Details

Committed
ributzkaAug 13 2014, 3:13 PM
Parents
rL215590: ClangTidyTests: Suppress FixHeaderGuards on win32 for now.
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