Change GotoStmt's to have a pointer to the LabelStmt instead of a pointer to
the label identifier.  Handle fwd references etc.  This allows us to detect
uses of undefined labels and label redefinitions, such as:

t.c:2:12: error: redefinition of label 'abc'
  abc: ;   abc:
           ^
t.c:2:3: error: previous definition is here
  abc: ;   abc:
  ^
t.c:12:12: error: use of undeclared label 'hijl'
      goto hijl;
           ^

llvm-svn: 39509
6 files changed
tree: 3c7fc6db9a4852b554563aa0dcab6a6b3bf1682f
  1. clang/
  2. llvm/
  3. stacker/