asm: make use regular asserts that will just work on baremetal

Previously had wonky line pointer in asm_main. New interface simpler and more portable.

Add tests for ASSERT_EQ_ and family in arm and aarch64, previously on x86_64.

ASSERT_EQ_ and family in ARM can now either take =123, =addr or var, before this
the = was added on macros so var was not possible.

Define the main function directly in assembly, the C driver was useless.

build-userland

@@ -60,25 +60,6 @@ Default: build all examples that have their package dependencies met, e.g.:
             extra_deps=[self.env['common_h']],
             link=False,
         )
-        extra_obj_userland_asm = os.path.join(
-            build_dir,
-            'arch',
-            'main' + self.env['obj_ext']
-        )
-        extra_obj_userland_asm_relpath = os.path.join(
-            'arch',
-            'main' + self.env['c_ext']
-        )
-        self._build_one(
-            in_path=os.path.join(
-                self.env['userland_source_dir'],
-                extra_obj_userland_asm_relpath
-            ),
-            out_path=extra_obj_userland_asm,
-            cc_flags=cc_flags,
-            extra_deps=[self.env['common_h']],
-            link=False,
-        )
         with thread_pool.ThreadPool(
             self._build_one,
             nthreads=self.env['nproc'],
@@ -94,7 +75,6 @@ Default: build all examples that have their package dependencies met, e.g.:
                         my_thread_pool.submit({
                             'cc_flags': cc_flags,
                             'extra_objs_lkmc_common': [extra_obj_lkmc_common],
-                            'extra_objs_userland_asm': [extra_obj_userland_asm],
                             'in_path': in_path,
                             'out_path': self.resolve_userland_executable(in_path),
                         })