InstCombine: Canonicalize addrspacecast between different element types

addrspacecast X addrspace(M)* to Y addrspace(N)*

-->

bitcast X addrspace(M)* to Y addrspace(M)*
addrspacecast Y addrspace(M)* to Y addrspace(N)*

Updat all affected tests and add several new tests in addrspacecast.ll.

This patch is based on http://reviews.llvm.org/D2186 (authored by Matt
Arsenault) with fixes and more tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210375 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: pubnames: include file-local (static or anonymous namespace) variables and anonymous namespaces themselves.

Still some issues with name qualification, FIXMEs added to test cases
and fixes will come next.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210378 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Use the scope of the function declaration, if any, to name a function in DWARF pubnames

This ensures that member functions, for example, are entered into
pubnames with their fully qualified name, rather than inside the global
namespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210379 91177308-0d34-0410-b5e6-96231b3b80d8
ADT: introduce isWindowsItaniumEnvironment

Add an isWindowsItaniumEnvironment function to Triple to mirror the other
Windows environments.  This is simply a utility function to check if we are
targeting windows-itanium rather than windows-msvc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210383 91177308-0d34-0410-b5e6-96231b3b80d8