start splitting out aggregate value computation from EmitExpr into EmitAggExpr.

aggregate value and scalar expression computation are very different, this
gets them away from each other.  This causes a temporary regression on some
complex number examples.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41014 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed