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[AArch64] Remove Unsupported = 1 flag for the WriteAtomic WriteRes.

Authored by joelkevinjones on Jan 11 2018, 8:50 AM.

Description

[AArch64] Remove Unsupported = 1 flag for the WriteAtomic WriteRes.

In practice, this patch has no effect on scheduling.

There is no test case as there already exists a comprehensive test case for
LSE Atomics.

Patch by Stefan Teleman

Differential Revision: https://reviews.llvm.org/D40694

llvm-svn: 322291