Improved handling of static data in the expression

parser.  Now expression like the following work as
expected:

-
(lldb) expr struct { int a; int b; } $blah = { 10, 20 }
<no result>
(lldb) expr $blah
(<anonymous struct at Parse:6:5>) $blah = {
  (int) a = 10
  (int) b = 20
}
-

Now the IRForTarget subsystem knows how to handle
static initializers of various composite types.

Also removed an unnecessary parameter from
ClangExpressionDeclMap::GetFunctionInfo.

llvm-svn: 142936