Eliminate SwiftCompilerSupport module.

This module is no longer needed by the Swift compiler, because we have
subsumed its functionality into the compiler's ASTGen module.

Author: DougGregor

.spi.yml

@@ -10,7 +10,6 @@ builder:
       - SwiftSyntax
       - IDEUtils
       - SwiftBasicFormat
-      - SwiftCompilerSupport
       - SwiftDiagnostics
       - SwiftOperators
       - SwiftParser

Package.swift

@@ -122,15 +122,6 @@ let package = Package(
         "CMakeLists.txt",
       ]
     ),
-    .target(
-      name: "SwiftCompilerSupport",
-      dependencies: ["SwiftSyntax", "SwiftParser", "SwiftParserDiagnostics",
-                     "SwiftDiagnostics", "SwiftOperators"],
-      exclude: [
-        "CMakeLists.txt",
-        "SwiftCompilerSupport.h"
-      ]
-    ),
     .target(
       name: "_SwiftSyntaxMacros",
       dependencies: [

Sources/CMakeLists.txt

@@ -39,5 +39,4 @@ add_subdirectory(SwiftParserDiagnostics)
 add_subdirectory(SwiftOperators)
 add_subdirectory(SwiftSyntaxBuilder)
 add_subdirectory(_SwiftSyntaxMacros)
-add_subdirectory(SwiftCompilerSupport)
 add_subdirectory(IDEUtils)