Add support for language-specific address spaces.  On top of that,
add support for the OpenCL __private, __local, __constant and
__global address spaces, as well as the __read_only, _read_write and
__write_only image access specifiers.  Patch originally by ARM;
language-specific address space support by myself.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/AttributeList.cpp b/lib/Sema/AttributeList.cpp
index 1663fd5..a715989 100644
--- a/lib/Sema/AttributeList.cpp
+++ b/lib/Sema/AttributeList.cpp
@@ -94,6 +94,7 @@
     .Case("unavailable", AT_unavailable)
     .Case("overloadable", AT_overloadable)
     .Case("address_space", AT_address_space)
+    .Case("opencl_image_access", AT_opencl_image_access)
     .Case("always_inline", AT_always_inline)
     .Case("returns_twice", IgnoredAttribute)
     .Case("vec_type_hint", IgnoredAttribute)