Highlight "raise", "reraise", "typeof", "typedefof", "sizeof", "nameof" as keywords (dotnet#2475)

* highlight "raise", "reraise", "typeof", "typedefof", "sizeof", "nameof" as keywords

* fix compilation

* colorize forgotten "int8" and "uint8" as keywords

Author: vasily-kirichenko

Classification/ClassificationDefinitions.fs

@@ -40,7 +40,8 @@ module internal FSharpClassificationTypes =
         | SemanticClassificationType.MutableVar -> MutableVar
         | SemanticClassificationType.Printf -> Printf
         | SemanticClassificationType.ComputationExpression
-        | SemanticClassificationType.IntrinsicType -> Keyword
+        | SemanticClassificationType.IntrinsicType
+        | SemanticClassificationType.IntrinsicFunction -> Keyword
         | SemanticClassificationType.UnionCase
         | SemanticClassificationType.Enumeration -> Enum
         | SemanticClassificationType.Property -> Property