added import to necessary files

Author: ChiduAnush

Sources/SwiftParser/Lexer/Cursor.swift

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 @_spi(RawSyntax) import SwiftSyntax
+@_spi(BumpPtrAllocator) import SwiftSyntax
 
 extension SyntaxText {
   fileprivate func containsPlaceholderEnd() -> Bool {

Sources/SwiftParser/Lexer/LexemeSequence.swift

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 @_spi(RawSyntax) import SwiftSyntax
+@_spi(BumpPtrAllocator) import SwiftSyntax
 
 extension Lexer {
   /// A sequence of ``Lexer/Lexeme`` tokens starting from a ``Lexer/Cursor``

Sources/SwiftParser/Lexer/RegexLiteralLexer.swift

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 @_spi(RawSyntax) import SwiftSyntax
+@_spi(BumpPtrAllocator) import SwiftSyntax
 
 /// A separate lexer specifically for regex literals.
 fileprivate struct RegexLiteralLexer {

Sources/SwiftParser/StringLiteralRepresentedLiteralValue.swift

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 @_spi(RawSyntax) import SwiftSyntax
+@_spi(BumpPtrAllocator) import SwiftSyntax
 
 extension StringLiteralExprSyntax {