[PATCH] Add pointer types to global named register

[Renato Golin]

Hi rnk, rafael,

This patch adds support for pointer types in global named registers variables.
It'll be lowered as a pair of read/write_register and inttoptr/ptrtoint calls.
Also adds some early checks on types on SemaDecl to avoid the assert.

Tests changed accordingly. (PR19837)

http://reviews.llvm.org/D3919

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/CodeGen/CGExpr.cpp
  lib/Sema/SemaDecl.cpp
  test/CodeGen/named_reg_global.c
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