Sink PrettyDeclStackTrace down to the AST library

...and add some very basic stack trace entries for module building.
This would have helped track down rdar://problem/38434694 sooner.

llvm-svn: 328276
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index deefcaf..f19bcaa 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -15,6 +15,7 @@
 #include "clang/Parse/RAIIObjectsForParser.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclTemplate.h"
+#include "clang/AST/PrettyDeclStackTrace.h"
 #include "clang/Basic/AddressSpaces.h"
 #include "clang/Basic/Attributes.h"
 #include "clang/Basic/CharInfo.h"
@@ -22,7 +23,6 @@
 #include "clang/Parse/ParseDiagnostic.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/ParsedTemplate.h"
-#include "clang/Sema/PrettyDeclStackTrace.h"
 #include "clang/Sema/Scope.h"
 #include "clang/Sema/SemaDiagnostic.h"
 #include "llvm/ADT/Optional.h"
@@ -3908,7 +3908,7 @@
 ///
 void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
                                   unsigned TagType, Decl *TagDecl) {
-  PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc,
+  PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
                                       "parsing struct/union body");
   assert(!getLangOpts().CPlusPlus && "C++ declarations not supported");