Revert "sequential"

This reverts commit 8c77c0c.

src/Compiler/Facilities/DiagnosticsLogger.fs

@@ -895,7 +895,6 @@ type StackGuard(maxDepth: int, name: string) =
         GetEnvInteger ("FSHARP_" + name + "StackGuardDepth") StackGuard.DefaultDepth
 
 module MultipleDiagnosticsLoggers =
-
     let Parallel computations =
         let computationsWithLoggers, diagnosticsReady =
             [
@@ -943,8 +942,6 @@ module MultipleDiagnosticsLoggers =
             let results = ResizeArray()
 
             for computation in computations do
-                // Encapsulate computation's diagnostics scope.
-                use _ = new CompilationGlobalsScope()
                 let! result = computation
                 results.Add result
 

src/Compiler/Facilities/DiagnosticsLogger.fsi

@@ -474,13 +474,12 @@ type CompilationGlobalsScope =
 
 module MultipleDiagnosticsLoggers =
 
-    /// Runs computations using Async.Parallel.
-    /// Capturing the diagnostics from each separately.
-    /// When done, restores caller's BuildPhase and DiagnosticsLogger
-    /// and commits captured diagnostics preserving the order.
+    /// Execute computations using Async.Parallel.
+    /// Captures the diagnostics in correct order and keeps a common error count for all computations.
+    /// When done, restores caller's build phase and diagnostics logger, commiting captured diagnostics.
     val Parallel: computations: Async<'T> seq -> Async<'T array>
 
-    /// Run computations sequentially starting on current thread
-    /// using caller's DiagnosticsLogger and BuildPhase for each computation.
-    /// When done, restores caller's BuildPhase and DiagnosticsLogger.
+    /// Execute computations using Async.Sequential.
+    /// Captures the diagnostics in correct order and keeps a common error count for all computations.
+    /// When done, restores caller's build phase and diagnostics logger, commiting captured diagnostics.
     val Sequential: computations: Async<'T> seq -> Async<'T array>