[PATCH] Support for address space casting in order to map these on the new 'addrspacecast' IR instruction

[Michele Scandale]

Hi rjmccall, rsmith,

This patch introduces a new kind of cast to support explicit address space conversions. Starting from llvm r194760 it has been added a new IR instruction named 'addrspacecast' that is used to represent conversion between address

This version of the patch now is limited to C pointers, I don't know if this would require also the extension other pointer kinds.

http://llvm-reviews.chandlerc.com/D2241

Files:
  include/clang/AST/OperationKinds.h
  lib/AST/Expr.cpp
  lib/AST/ExprConstant.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprAgg.cpp
  lib/CodeGen/CGExprComplex.cpp
  lib/CodeGen/CGExprConstant.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/Edit/RewriteObjCFoundationAPI.cpp
  lib/Sema/SemaExpr.cpp
  lib/StaticAnalyzer/Core/ExprEngineC.cpp
  test/CodeGenOpenCL/address-spaces-cast.cl
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