[gccrs COMMIT] Add no_std to builtin attributes

[gerris.rs@gmail.com]

From: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

no_std is a builtin attribute required for rust-for-linux but was
missing from the builtin attribute list and instead considered an unknown
attribute macro invocation.

gcc/rust/ChangeLog:

	* util/rust-attributes.cc: Add no_std to list of builtin attributes.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
---
This change was merged into the gccrs repository and is posted here for
upstream visibility and potential drive-by review, as requested by GCC
release managers.
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Commit on github: https://github.com/Rust-GCC/gccrs/commit/13cfa5da574bed2514d06308beafbf420e0ff7bb

The commit has been mentioned in the following pull-request(s):
 - https://github.com/Rust-GCC/gccrs/pull/4466

 gcc/rust/util/rust-attributes.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
index d246cc672..93d71a490 100644
--- a/gcc/rust/util/rust-attributes.cc
+++ b/gcc/rust/util/rust-attributes.cc
@@ -98,6 +98,7 @@ static const BuiltinAttrDefinition __definitions[]
      // #![feature(rustc_attrs)]
      {Attrs::FEATURE, STATIC_ANALYSIS},
      {Attrs::NO_CORE, CODE_GENERATION},
+     {Attrs::NO_STD, CODE_GENERATION},
      {Attrs::DOC, EXTERNAL},
      {Attrs::CRATE_NAME, CODE_GENERATION},
      {Attrs::CRATE_TYPE, CODE_GENERATION},

base-commit: 7aa3e7792737ab5ce818fdd240a37c9a80cc919d
-- 
2.53.0