Merge r9428 into 3.6 branch: Avoid using C++ STL include <limits>.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 6c6966aee53194b1c85b8a9a2d7822a16b235860..d0c78d6e22b7e82a6289c69015fde7faa7d66f0e 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -255,6 +255,10 @@ const int kBinary32MinExponent  = 0x01;
 const int kBinary32MantissaBits = 23;
 const int kBinary32ExponentShift = 23;
 
+// Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
+// other bits set.
+const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
+
 // ASCII/UC16 constants
 // Code-point values in Unicode 4.0 are 21 bits wide.
 typedef uint16_t uc16;