Use fast_sqrt instead of std::sqrt in simulators.

src/mips64/simulator-mips64.cc

Index: src/mips64/simulator-mips64.cc
diff --git a/src/mips64/simulator-mips64.cc b/src/mips64/simulator-mips64.cc
index 9899d47a0e5ec940d99bf1514827f6f57f2187f9..883991768c2386502e55461ba0acab8e0dc9ee76 100644
--- a/src/mips64/simulator-mips64.cc
+++ b/src/mips64/simulator-mips64.cc
@@ -13,6 +13,7 @@
 
 #include "src/assembler.h"
 #include "src/base/bits.h"
+#include "src/codegen.h"
 #include "src/disasm.h"
 #include "src/mips64/constants-mips64.h"
 #include "src/mips64/simulator-mips64.h"
@@ -2391,7 +2392,7 @@ void Simulator::DecodeTypeRegister(Instruction* instr) {
               set_fpu_register_double(fd_reg, -fs);
               break;
             case SQRT_D:
-              set_fpu_register_double(fd_reg, sqrt(fs));
+              set_fpu_register_double(fd_reg, fast_sqrt(fs));
               break;
             case C_UN_D:
               set_fcsr_bit(fcsr_cc, std::isnan(fs) || std::isnan(ft));