Reverts r183466: "Perform dynamic alignment computations..."

This introduces bugs in TemplateSpecializationTypeLoc's angle bracket
locations.

Regression test follows in a subsequent commit.

llvm-svn: 183513

clang/lib/Sema/SemaTemplateVariadic.cpp

@@ -18,7 +18,6 @@
 #include "clang/Sema/ScopeInfo.h"
 #include "clang/Sema/SemaInternal.h"
 #include "clang/Sema/Template.h"
-#include "TypeLocBuilder.h"
 
 using namespace clang;
 
@@ -464,13 +463,17 @@ Sema::CheckPackExpansion(TypeSourceInfo *Pattern, SourceLocation EllipsisLoc,
                                        EllipsisLoc, NumExpansions);
   if (Result.isNull())
     return 0;
-
-  TypeLocBuilder TLB;
-  TLB.pushFullCopy(Pattern->getTypeLoc());
-  PackExpansionTypeLoc TL = TLB.push<PackExpansionTypeLoc>(Result);
+  
+  TypeSourceInfo *TSResult = Context.CreateTypeSourceInfo(Result);
+  PackExpansionTypeLoc TL =
+      TSResult->getTypeLoc().castAs<PackExpansionTypeLoc>();
   TL.setEllipsisLoc(EllipsisLoc);
-
-  return TLB.getTypeSourceInfo(Context, Result);
+  
+  // Copy over the source-location information from the type.
+  memcpy(TL.getNextTypeLoc().getOpaqueData(),
+         Pattern->getTypeLoc().getOpaqueData(),
+         Pattern->getTypeLoc().getFullDataSize());
+  return TSResult;
 }
 
 QualType Sema::CheckPackExpansion(QualType Pattern, SourceRange PatternRange,