Fix implementation of compare-minus-zero-and-branch on ia32 and x64.

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 14a40baa19e08fee26c268c1018438266da70474..bc46113cc82037bab44f3579d41fff24ecfc6544 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2689,7 +2689,7 @@ void LCodeGen::DoCompareMinusZeroAndBranch(LCompareMinusZeroAndBranch* instr) {
   } else {
     Register value = ToRegister(instr->value());
     Handle<Map> map = masm()->isolate()->factory()->heap_number_map();
-    __ CheckMap(eax, map, &if_false, DO_SMI_CHECK);
+    __ CheckMap(value, map, &if_false, DO_SMI_CHECK);
     __ cmp(FieldOperand(value, HeapNumber::kExponentOffset),
            Immediate(0x80000000));
     __ j(not_equal, &if_false);