Port r11517 (not deopt Math.floor on negative input) to x64, sse2.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 5225763a3868219684ec8f454d39c0ab17fc7785..e27a32628ea69ed015cb984d276b056847dfb9af 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3169,8 +3169,7 @@ void LCodeGen::DoMathFloor(LUnaryMathOperation* instr) {
     __ cmp(output_reg, 0x80000000u);
     DeoptimizeIf(equal, instr->environment());
   } else {
-    Label negative_sign;
-    Label done;
+    Label negative_sign, done;
     // Deoptimize on unordered.
     __ xorps(xmm_scratch, xmm_scratch);  // Zero the register.
     __ ucomisd(input_reg, xmm_scratch);
@@ -3196,9 +3195,9 @@ void LCodeGen::DoMathFloor(LUnaryMathOperation* instr) {
     DeoptimizeIf(equal, instr->environment());
     __ jmp(&done, Label::kNear);
 
-    // Non-zero negative reaches here
+    // Non-zero negative reaches here.
     __ bind(&negative_sign);
-    // Truncate, then compare and compensate
+    // Truncate, then compare and compensate.
     __ cvttsd2si(output_reg, Operand(input_reg));
     __ cvtsi2sd(xmm_scratch, output_reg);
     __ ucomisd(input_reg, xmm_scratch);