[PATCH] Adding type info for f16c floating-point type

[Yunzhong Gao]

  Ping again.

  Some additional information: Right now, only OpenCL supports this type in terms of language spec (plus
  a number of shading languages, but clang does not support them), but AFAIK OpenCL does not support
  exceptions. ARM and x86 have this type as an extension: storage-only type, not as argument or return
  type. So maybe exception handling is not supported on those targets, i.e., one cannot throw a half-
  precision floating point typed object.

  It is not clear whether the typeid operator is supposed to work on this type.
  ```
  __fp16 foo = 1.5f;

  #include <typeinfo>
  const char *get_type() {
    return typeid(foo).name();
  }
  ```
  Any comments or suggestions?

http://llvm-reviews.chandlerc.com/D2750