Merge "Code cleanup inside vp9_firstpass.c." into experimental

vp9/common/vp9_common.h

@@ -52,6 +52,10 @@ static INLINE int clamp(int value, int low, int high) {
   return value < low ? low : (value > high ? high : value);
 }
 
+static INLINE double fclamp(double value, double low, double high) {
+  return value < low ? low : (value > high ? high : value);
+}
+
 static INLINE int multiple16(int value) {
   return (value + 15) & ~15;
 }