Explicit cast to double for i64 intmax.

Author: sahas3

mlir/lib/Conversion/TosaToLinalg/TosaToLinalg.cpp

@@ -561,9 +561,9 @@ static Value createLinalgBodyCalculationForElementwiseOp(
       auto intMaxPlusOneFP = rewriter.create<arith::ConstantOp>(
           loc, rewriter.getFloatAttr(
                    getElementTypeOrSelf(srcTy),
-                   APInt::getSignedMaxValue(dstTy.getIntOrFloatBitWidth())
-                           .getSExtValue() +
-                       1.0));
+                   static_cast<double>(APInt::getSignedMaxValue(dstTy.getIntOrFloatBitWidth())
+                           .getSExtValue()) +
+                       1.0f));
 
       auto intMax = rewriter.create<arith::ConstantOp>(
           loc, rewriter.getIntegerAttr(