Fix math.round with SSE4.1.

R=verwaest@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/12388015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13771 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/lithium-codegen-ia32.cc

@@ -3755,7 +3755,7 @@ void LCodeGen::DoMathRound(LUnaryMathOperation* instr) {
     CpuFeatures::Scope scope(SSE4_1);
 
     __ addsd(xmm_scratch, input_reg);
-    __ roundsd(xmm_scratch, input_reg, Assembler::kRoundDown);
+    __ roundsd(xmm_scratch, xmm_scratch, Assembler::kRoundDown);
     __ cvttsd2si(output_reg, Operand(xmm_scratch));
     // Overflow is signalled with minint.
     __ cmp(output_reg, 0x80000000u);

src/x64/lithium-codegen-x64.cc

@@ -3543,7 +3543,7 @@ void LCodeGen::DoMathRound(LUnaryMathOperation* instr) {
   if (CpuFeatures::IsSupported(SSE4_1) && !minus_zero_check) {
     CpuFeatures::Scope scope(SSE4_1);
     __ addsd(xmm_scratch, input_reg);
-    __ roundsd(xmm_scratch, input_reg, Assembler::kRoundDown);
+    __ roundsd(xmm_scratch, xmm_scratch, Assembler::kRoundDown);
     __ cvttsd2si(output_reg, xmm_scratch);
     // Overflow is signalled with minint.
     __ cmpl(output_reg, Immediate(0x80000000));