lebedev.ri added inline comments.

================
Comment at: include/clang/AST/Expr.h:2791
+public:
+  using BasePathSizeTy = unsigned short;
+  static_assert(std::numeric_limits<BasePathSizeTy>::max() >= 16384,
----------------
erichkeane wrote:
> I'll let @rjmccall comment here, but I think I'd be willing to give up 2 more 
> bytes here and just go with unsigned int.  It has the advantage of likely 
> never being an issue again (since 4 billion bases is not an issue).
> 
> We might be paying for those 2 ANYWAY with alignment as well, right?
Yes, i do expect that we are paying for 2 bytes in padding already.


================
Comment at: include/clang/AST/Expr.h:2805
+  }
+  BasePathSizeTy &BasePathSize();
+
----------------
erichkeane wrote:
> Why is this a reference?  This seems odd... It seems that the const-cast 
> magic above shouldn't be necessary either.
I'll make it a pointer and replace `BasePathSizeTy BasePathSize() const` with 
`path_size()`.
I don't really think it would be good to get rid of this pointer/reference, 
since then
we'd have more than one function doing what `CastExpr::BasePathSizeTy 
*CastExpr::BasePathSize()` does now.


Repository:
  rC Clang

https://reviews.llvm.org/D50050



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