aro_translate_c: do not translate _Static_assert declarations

This does not completely ignore static asserts - they are validated by aro
during parsing; any failures will render an error and non-zero exit code.

Emit a warning comment that _Static_asserts are not translated - this
matches the behavior of the existing clang-based translate-c.

Aro currently does not store source locations for _Static_assert
declarations so I've hard-coded token index 0 for now.

lib/compiler/aro_translate_c.zig

@@ -228,6 +228,7 @@ fn prepopulateGlobalNameTable(c: *Context) !void {
                 const decl_name = c.tree.tokSlice(data.decl.name);
                 try c.global_names.put(c.gpa, decl_name, {});
             },
+            .static_assert => {},
             else => unreachable,
         }
     }
@@ -305,6 +306,7 @@ fn transDecl(c: *Context, scope: *Scope, decl: NodeIndex) !void {
         => {
             try transVarDecl(c, decl, null);
         },
+        .static_assert => try warn(c, &c.global_scope.base, 0, "ignoring _Static_assert declaration", .{}),
         else => unreachable,
     }
 }

test/cases/translate_c/_Static_assert.c

@@ -0,0 +1,7 @@
+_Static_assert(1 == 1, "");
+
+// translate-c
+// target=x86_64-linux
+// c_frontend=aro
+//
+// tmp.c:1:1: warning: ignoring _Static_assert declaration