Avoid Attr.h includes, CodeGen edition
This saves around 20 includes of Attr.h. Not much.
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 0bdf535..d0832fb 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -17,7 +17,6 @@
#include "CodeGenTypeCache.h"
#include "CodeGenTypes.h"
#include "SanitizerMetadata.h"
-#include "clang/AST/Attr.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclOpenMP.h"
@@ -77,6 +76,9 @@
class CXXDestructorDecl;
class Module;
class CoverageSourceInfo;
+class TargetAttr;
+class InitSegAttr;
+struct ParsedTargetAttr;
namespace CodeGen {