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refactor some attribute functions in rust-hir-map.cc and rust-early-name-resolver.cc #3344

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gcc/rust/ChangeLog:
* resolve/rust-early-name-resolver.cc (EarlyNameResolver::visit): "modified impl"
* util/rust-attributes.cc (Attributes::is_rustc_builtin_macro): "helper function"
* util/rust-attributes.h: "added"
* util/rust-hir-map.cc (Mappings::insert_macro_def): "modified impl"

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Addresses #3291

*Please write a comment explaining your change. This is the message
that will be part of the merge commit.

	* resolve/rust-early-name-resolver.cc (EarlyNameResolver::visit): "modified impl"
	* util/rust-attributes.cc (Attributes::is_rustc_builtin_macro): "helper function"
	* util/rust-attributes.h: "added"
	* util/rust-hir-map.cc (Mappings::insert_macro_def): "modified impl"

Signed-off-by: Om Swaroop Nayak <[email protected]>
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some cleanup needed

for (auto attr : outer_attrs)
{
if (attr.get_path () == Values::Attributes::RUSTC_BUILTIN_MACRO)
{
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You can just do return true here no need for the extra braces

bool
Attributes::is_rustc_builtin_macro (AST::AttrVec outer_attrs)
{
for (auto attr : outer_attrs)
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you should probably do const auto attr

@@ -37,6 +37,18 @@ Attributes::is_known (const std::string &attribute_path)

return !lookup.is_error ();
}
bool
Attributes::is_rustc_builtin_macro (AST::AttrVec outer_attrs)
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You should be using const AST::AttrVec& outer_attrs since this can be constified

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