Revert of Remove obsolete V8_INFINITY macro.

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 86b1d8ef3ab5b3ede644ba9c601f88a9b9c04c00..9899d47a0e5ec940d99bf1514827f6f57f2187f9 100644
--- a/src/mips64/simulator-mips64.cc
+++ b/src/mips64/simulator-mips64.cc
@@ -1204,8 +1204,7 @@
     set_fcsr_bit(kFCSRInexactFlagBit, true);
   }
 
-  if (rounded < std::numeric_limits<double>::min() &&
-      rounded > -std::numeric_limits<double>::min() && rounded != 0) {
+  if (rounded < DBL_MIN && rounded > -DBL_MIN && rounded != 0) {
     set_fcsr_bit(kFCSRUnderflowFlagBit, true);
     ret = true;
   }
@@ -1237,8 +1236,7 @@
     set_fcsr_bit(kFCSRInexactFlagBit, true);
   }
 
-  if (rounded < std::numeric_limits<double>::min() &&
-      rounded > -std::numeric_limits<double>::min() && rounded != 0) {
+  if (rounded < DBL_MIN && rounded > -DBL_MIN && rounded != 0) {
     set_fcsr_bit(kFCSRUnderflowFlagBit, true);
     ret = true;
   }