Transform post-increment on float/double. Fixes #1764

ICSharpCode.Decompiler.Tests/TestCases/Pretty/CompoundAssignmentTest.cs

@@ -4721,6 +4721,16 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 			return (*GetPointer())++;
 		}
 
+		public float PostIncrementFloat(float f)
+		{
+			return f++;
+		}
+
+		public double PostIncrementDouble(double d)
+		{
+			return d++;
+		}
+
 		public void Issue1552Pre(CustomStruct a, CustomStruct b)
 		{
 			CustomStruct customStruct = a + b;

ICSharpCode.Decompiler/CSharp/ExpressionBuilder.cs

@@ -1511,7 +1511,7 @@ namespace ICSharpCode.Decompiler.CSharp
 			TranslatedExpression resultExpr;
 			if (inst.EvalMode == CompoundEvalMode.EvaluatesToOldValue) {
 				Debug.Assert(op == AssignmentOperatorType.Add || op == AssignmentOperatorType.Subtract);
-				Debug.Assert(inst.Value.MatchLdcI(1));
+				Debug.Assert(inst.Value.MatchLdcI(1) || inst.Value.MatchLdcF4(1) || inst.Value.MatchLdcF8(1));
 				UnaryOperatorType unary;
 				ExpressionType exprType;
 				if (op == AssignmentOperatorType.Add) {

ICSharpCode.Decompiler/IL/Transforms/TransformAssignment.cs

@@ -643,7 +643,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 			}
 			StLoc stloc;
 			var binary = UnwrapSmallIntegerConv(value, out var conv) as BinaryNumericInstruction;
-			if (binary != null && binary.Right.MatchLdcI(1)) {
+			if (binary != null && (binary.Right.MatchLdcI(1) || binary.Right.MatchLdcF4(1) || binary.Right.MatchLdcF8(1))) {
 				if (!(binary.Operator == BinaryNumericOperator.Add || binary.Operator == BinaryNumericOperator.Sub))
 					return false;
 				if (!ValidateCompoundAssign(binary, conv, targetType))
@@ -717,7 +717,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return false;
 			}
 			if (UnwrapSmallIntegerConv(value, out var conv) is BinaryNumericInstruction binary) {
-				if (!binary.Left.MatchLdLoc(tmpVar) || !binary.Right.MatchLdcI(1))
+				if (!binary.Left.MatchLdLoc(tmpVar) || !(binary.Right.MatchLdcI(1) || binary.Right.MatchLdcF4(1) || binary.Right.MatchLdcF8(1)))
 					return false;
 				if (!(binary.Operator == BinaryNumericOperator.Add || binary.Operator == BinaryNumericOperator.Sub))
 					return false;