[LLVMSupport] Remove raw_ostream.h and drop dependencies to it from the runtime

Author: kubamracek

include/swift/AST/Decl.h

@@ -207,6 +207,9 @@ enum class AssociatedValueCheck {
 /// Diagnostic printing of \c StaticSpellingKind.
 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, StaticSpellingKind SSK);
 
+/// Diagnostic printing of \c ReferenceOwnership.
+llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, ReferenceOwnership RO);
+
 /// Encapsulation of the overload signature of a given declaration,
 /// which is used to determine uniqueness of a declaration within a
 /// given context.

include/swift/AST/Ownership.h

@@ -23,7 +23,6 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
 #include <assert.h>
 #include <limits.h>
 #include <stdint.h>
@@ -118,9 +117,6 @@ optionalityOf(ReferenceOwnership ownership) {
   llvm_unreachable("impossible");
 }
 
-/// Diagnostic printing of \c StaticSpellingKind.
-llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, ReferenceOwnership RO);
-
 /// Different kinds of value ownership supported by Swift.
 enum class ValueOwnership : uint8_t {
   /// the context-dependent default ownership (sometimes shared,