MIPS: Fix abs_d instruction in the simulator.

src/mips/simulator-mips.cc

Index: src/mips/simulator-mips.cc
diff --git a/src/mips/simulator-mips.cc b/src/mips/simulator-mips.cc
index baf042c3b2191d0db70fd7e22b25228ff120f26f..d8a39ab30c764701e2d481f62c9affd3cd601f07 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -2091,7 +2091,7 @@ void Simulator::DecodeTypeRegister(Instruction* instr) {
               set_fpu_register_double(fd_reg, fs / ft);
               break;
             case ABS_D:
-              set_fpu_register_double(fd_reg, fs < 0 ? -fs : fs);
+              set_fpu_register_double(fd_reg, fabs(fs));
               break;
             case MOV_D:
               set_fpu_register_double(fd_reg, fs);