DRTVWR-476: Explicitly cast 64-bit NaN constant to F32 as needed.

VS 2017 was complaining about truncating the value.

indra/llcommon/lltraceaccumulators.cpp

@@ -291,8 +291,8 @@ void EventAccumulator::reset( const EventAccumulator* other )
 {
 	mNumSamples = 0;
 	mSum = 0;
-	mMin = NaN;
-	mMax = NaN;
+	mMin = F32(NaN);
+	mMax = F32(NaN);
 	mMean = NaN;
 	mSumOfSquares = 0;
 	mLastValue = other ? other->mLastValue : NaN;

indra/llcommon/lltraceaccumulators.h

@@ -242,8 +242,8 @@ namespace LLTrace
 
 		EventAccumulator()
 		:	mSum(0),
-			mMin(NaN),
-			mMax(NaN),
+			mMin(F32(NaN)),
+			mMax(F32(NaN)),
 			mMean(NaN),
 			mSumOfSquares(0),
 			mNumSamples(0),
@@ -313,8 +313,8 @@ namespace LLTrace
 
 		SampleAccumulator()
 		:	mSum(0),
-			mMin(NaN),
-			mMax(NaN),
+			mMin(F32(NaN)),
+			mMax(F32(NaN)),
 			mMean(NaN),
 			mSumOfSquares(0),
 			mLastSampleTimeStamp(0),