Run IL spread tests only against .NET (Core)

The compiler emits various types from the
System.Diagnostics.CodeAnalysis namespace for the .NET Framework target,
but those types come from the runtime for the .NET (Core) target.
Since the only IL that is material here is the field names, types, and
ordering, and since the spread logic is entirely
framework/runtime-agnostic, it is simpler to run these tests only for
the .NET (Core) target.

Author: brianrourkeboll

tests/FSharp.Compiler.ComponentTests/EmittedIL/Spreads/AnonymousRecordExpressionSpreads.fs

@@ -2,7 +2,13 @@ module EmittedIL.AnonymousRecordExpressionSpreads
 
 open FSharp.Test
 open FSharp.Test.Compiler
-open Xunit
+
+/// Various types in the System.Diagnostics.CodeAnalysis namespace will be generated by the compiler
+/// for the Framework target but will be included in the runtime for the .NET (Core) target.
+/// Since the only IL that is material here is the field names, types, and ordering,
+/// and since the spread logic is entirely framework/runtime-agnostic,
+/// it is simpler to run these tests only for the .NET (Core) target.
+type TheoryAttribute = TheoryForNETCOREAPPAttribute
 
 let [<Literal>] SupportedLangVersion = "preview"
 

tests/FSharp.Compiler.ComponentTests/EmittedIL/Spreads/NominalRecordExpressionSpreads.fs

@@ -2,7 +2,13 @@ module EmittedIL.NominalRecordExpressionSpreads
 
 open FSharp.Test
 open FSharp.Test.Compiler
-open Xunit
+
+/// Various types in the System.Diagnostics.CodeAnalysis namespace will be generated by the compiler
+/// for the Framework target but will be included in the runtime for the .NET (Core) target.
+/// Since the only IL that is material here is the field names, types, and ordering,
+/// and since the spread logic is entirely framework/runtime-agnostic,
+/// it is simpler to run these tests only for the .NET (Core) target.
+type TheoryAttribute = TheoryForNETCOREAPPAttribute
 
 let [<Literal>] SupportedLangVersion = "preview"
 

tests/FSharp.Compiler.ComponentTests/EmittedIL/Spreads/RecordTypeSpreads.fs

@@ -2,7 +2,13 @@ module EmittedIL.RecordTypeSpreads
 
 open FSharp.Test
 open FSharp.Test.Compiler
-open Xunit
+
+/// Various types in the System.Diagnostics.CodeAnalysis namespace will be generated by the compiler
+/// for the Framework target but will be included in the runtime for the .NET (Core) target.
+/// Since the only IL that is material here is the field names, types, and ordering,
+/// and since the spread logic is entirely framework/runtime-agnostic,
+/// it is simpler to run these tests only for the .NET (Core) target.
+type TheoryAttribute = TheoryForNETCOREAPPAttribute
 
 let [<Literal>] SupportedLangVersion = "preview"
 

tests/FSharp.Compiler.ComponentTests/EmittedIL/Spreads/Type_NoOverlap_SpreadFromAnon.fs

@@ -1,2 +1,3 @@
+type R1 = {| A : int; B : int |}
 [<NoEquality; NoComparison; DefaultAugmentation(false)>]
-type R2 = { ...{| A : int; B : int |}; C : int }
+type R2 = { ...R1; C : int }