testsuite: fix optasm tests for wasm32

(cherry picked from commit af771148)

testsuite/tests/cmm/should_compile/all.T

@@ -4,6 +4,7 @@ setTestOpts(
 
 test('selfloop', [cmm_src], compile, ['-no-hs-main'])
 test('cmm_sink_sp', [ only_ways(['optasm']),
+                      when(arch('wasm32'), fragile(24152)),
                       grep_errmsg(r'(\[Sp.*\]).*(=).*(\[.*R1.*\]).*;',[1,2,3]),
                       cmm_src], compile, ['-no-hs-main -ddump-cmm -dsuppress-uniques -O'])