Bug #:

Submitted by:
Reviewed by:
Continue working on type checking for unary operators. Added:

- Two 3 private functions to Sema: CheckAddressOfOperand(), CheckIndirectionOperand(),
and getDecl().
- Added Expr::isLvalue() - it was needed for CheckAddressOfOperand(). It will
also be needed for ++/-- and the assignment operators.
- Added a couple diagnostics for invalid lvalues (for & of).

llvm-svn: 39408