Revert "[BPF] Preserve debuginfo array/union/struct type/access index"

This reverts commit r365435.

Forgot adding the Differential Revision link. Will add to the
commit message and resubmit.

llvm-svn: 365436

1 files changed, 0 insertions, 29 deletions

diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 1f631ed2d9a..1e4f72902ec 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -1950,35 +1950,6 @@ form of ``__builtin_operator_delete`` is currently available.
 These builtins are intended for use in the implementation of ``std::allocator``
 and other similar allocation libraries, and are only available in C++.
 
-``__builtin_preserve_access_index``
------------------------------------
-
-``__builtin_preserve_access_index`` specifies a code section where
-array subscript access and structure/union member access are relocatable
-under bpf compile-once run-everywhere framework. Debuginfo (typically
-with ``-g``) is needed, otherwise, the compiler will exit with an error.
-
-**Syntax**:
-
-.. code-block:: c
-
-  const void * __builtin_preserve_access_index(const void * ptr)
-
-**Example of Use**:
-
-.. code-block:: c
-
-  struct t {
-    int i;
-    int j;
-    union {
-      int a;
-      int b;
-    } c[4];
-  };
-  struct t *v = ...;
-  const void *pb =__builtin_preserve_access_index(&v->c[3].b);
-
 Multiprecision Arithmetic Builtins
 ----------------------------------