Introduce Expr::Classify and Expr::ClassifyModifiable, which determine the classification of an expression under the C++0x taxology (value category). Reimplement isLvalue and isModifiableLvalue using these functions. No regressions in the test suite from this, and my rough performance check doesn't show any regressions either.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107007 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed