Allow aliases to be unnamed_addr.

Alias with unnamed_addr were in a strange state. It is stored in GlobalValue,
the language reference talks about "unnamed_addr aliases" but the verifier
was rejecting them.

It seems natural to allow unnamed_addr in aliases:

* It is a property of how it is accessed, not of the data itself.
* It is perfectly possible to write code that depends on the address
of an alias.

This patch then makes unname_addr legal for aliases. One side effect is that
the syntax changes for a corner case: In globals, unnamed_addr is now printed
before the address space.

llvm-svn: 210302
diff --git a/llvm/test/CodeGen/R600/local-memory-two-objects.ll b/llvm/test/CodeGen/R600/local-memory-two-objects.ll
index 1e42285..e29e4cc 100644
--- a/llvm/test/CodeGen/R600/local-memory-two-objects.ll
+++ b/llvm/test/CodeGen/R600/local-memory-two-objects.ll
@@ -1,8 +1,8 @@
 ; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck --check-prefix=EG-CHECK %s
 ; RUN: llc < %s -march=r600 -mcpu=verde -verify-machineinstrs | FileCheck --check-prefix=SI-CHECK %s
 
-@local_memory_two_objects.local_mem0 = internal addrspace(3) unnamed_addr global [4 x i32] zeroinitializer, align 4
-@local_memory_two_objects.local_mem1 = internal addrspace(3) unnamed_addr global [4 x i32] zeroinitializer, align 4
+@local_memory_two_objects.local_mem0 = internal unnamed_addr addrspace(3) global [4 x i32] zeroinitializer, align 4
+@local_memory_two_objects.local_mem1 = internal unnamed_addr addrspace(3) global [4 x i32] zeroinitializer, align 4
 
 ; EG-CHECK: @local_memory_two_objects