Add "template" keyword at strategic position to fix

compilation using g++ v3.4.

I'll watch the buildbots and back out if necessary.
Feel free to do the same if something breaks.

Without this patch I get (on g++ 3.4.6) following error:

In file included from clang/lib/Sema/SemaTemplate.cpp:14:
clang/lib/Sema/TreeTransform.h: In member function `clang::ASTOwningResult<&clang::ActionBase::DeleteExpr> clang::TreeTransform<Derived>::RebuildCXXPseudoDestructorExpr(clang::ASTOwningResult<&clang::ActionBase::DeleteExpr>, clang::SourceLocation, bool, clang::NestedNameSpecifier*, clang::SourceRange, clang::TypeSourceInfo*, clang::SourceLocation, clang::SourceLocation, clang::PseudoDestructorTypeStorage)':
clang/lib/Sema/TreeTransform.h:5784: error: expected primary-expression before '>' token
clang/lib/Sema/TreeTransform.h:5784: error: expected primary-expression before ')' token
make[4]: *** [clang/lib/Sema/Release/SemaTemplate.o] Error 1

llvm-svn: 97136