perf, powerpc: Fix up flush_branch_stack() users
The recent LBR rework for x86 left a stray flush_branch_stack() user in the PowerPC code, fix that up. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Anton Blanchard <anton@samba.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Christoph Lameter <cl@linux.com> Cc: Joel Stanley <joel@jms.id.au> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michael Neuling <mikey@neuling.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Tejun Heo <tj@kernel.org> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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