Add FSharpType.IsMeasureType (#14978)

* Add FSharpType.IsMeasureType

* Surface area updated

---------
Co-authored-by: NTomas Grosup <tomasgrosup@microsoft.com>

src/Compiler/Symbols/Symbols.fs

@@ -2423,6 +2423,13 @@ type FSharpType(cenv, ty:TType) =
          | TType_app _ | TType_measure (Measure.Const _ | Measure.Prod _ | Measure.Inv _ | Measure.One) -> true 
          | _ -> false
 
+    member _.IsMeasureType =
+       isResolved() &&
+       protect <| fun () ->
+        match stripTyparEqns ty with
+        | TType_measure _ -> true
+        | _ -> false
+
     member _.IsTupleType = 
        isResolved() &&
        protect <| fun () -> 

src/Compiler/Symbols/Symbols.fsi

@@ -1073,6 +1073,9 @@ type FSharpType =
     /// Get the generic arguments for a tuple type, a function type or a type constructed using a named entity
     member GenericArguments: IList<FSharpType>
 
+    /// Indicates if the type is a measure type.
+    member IsMeasureType: bool
+
     /// Indicates if the type is a tuple type (reference or struct). The GenericArguments property returns the elements of the tuple type.
     member IsTupleType: bool
 

tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.debug.bsl

@@ -5066,6 +5066,7 @@ FSharp.Compiler.Symbols.FSharpType: Boolean IsAbbreviation
 FSharp.Compiler.Symbols.FSharpType: Boolean IsAnonRecordType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsFunctionType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsGenericParameter
+FSharp.Compiler.Symbols.FSharpType: Boolean IsMeasureType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsStructTupleType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsTupleType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsUnresolved
@@ -5074,6 +5075,7 @@ FSharp.Compiler.Symbols.FSharpType: Boolean get_IsAbbreviation()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsAnonRecordType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsFunctionType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsGenericParameter()
+FSharp.Compiler.Symbols.FSharpType: Boolean get_IsMeasureType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsStructTupleType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsTupleType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsUnresolved()

tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.release.bsl

@@ -5066,6 +5066,7 @@ FSharp.Compiler.Symbols.FSharpType: Boolean IsAbbreviation
 FSharp.Compiler.Symbols.FSharpType: Boolean IsAnonRecordType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsFunctionType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsGenericParameter
+FSharp.Compiler.Symbols.FSharpType: Boolean IsMeasureType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsStructTupleType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsTupleType
 FSharp.Compiler.Symbols.FSharpType: Boolean IsUnresolved
@@ -5074,6 +5075,7 @@ FSharp.Compiler.Symbols.FSharpType: Boolean get_IsAbbreviation()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsAnonRecordType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsFunctionType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsGenericParameter()
+FSharp.Compiler.Symbols.FSharpType: Boolean get_IsMeasureType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsStructTupleType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsTupleType()
 FSharp.Compiler.Symbols.FSharpType: Boolean get_IsUnresolved()