Use fast_sqrt instead of std::sqrt in simulators.

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 fabca67062fab264b5c9dff0192c308c18e67b9f..79f337d3df05a2e18208b97a94977d2330563f93 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -13,6 +13,7 @@
 
 #include "src/assembler.h"
 #include "src/base/bits.h"
+#include "src/codegen.h"
 #include "src/disasm.h"
 #include "src/mips/constants-mips.h"
 #include "src/mips/simulator-mips.h"
@@ -2244,7 +2245,7 @@ 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));