Fixed modulo by a power of 2 on A64.

Actually setting flags before checking them might be a good idea... :-/

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/200113003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19924 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/a64/lithium-codegen-a64.cc

@@ -4139,7 +4139,7 @@ void LCodeGen::DoModByPowerOf2I(LModByPowerOf2I* instr) {
     // Note that this is correct even for kMinInt operands.
     __ Neg(dividend, dividend);
     __ And(dividend, dividend, Operand(mask));
-    __ Neg(dividend, dividend);
+    __ Negs(dividend, dividend);
     if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
       DeoptimizeIf(eq, instr->environment());
     }