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

[Michele Scandale]

  Extended version of the original patch that introduces a new CastKind in order to represent the address space conversion. It adds the support also for C++ cast operators: reintepret_cast is mapped to CK_BitCast that is lowered in a 'ptrtoint+inttoptr' pair, while static_cast is mapped to the new CK_AddressSpaceConversion that is lowered to 'addrspacecast'.

Hi pekka.jaaskelainen, rjmccall, rsmith,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2241?vs=5784&id=5830#toc

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/SemaCast.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaOverload.cpp
  lib/StaticAnalyzer/Core/ExprEngineC.cpp
  test/CodeGenCUDA/address-space-conversion.cu
  test/CodeGenCXX/address-space-conversions.cpp
  test/CodeGenOpenCL/address-space-conversion.cl
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