revert some changes

runtime/internal/runtime/tinygogc/gc_tinygo.go

@@ -449,8 +449,7 @@ func startMark(root uintptr) {
 
 			if gcStateOf(referencedBlock) == blockStateFree {
 				// The to-be-marked object doesn't actually exist.
-				// This could either be a dangling pointer (oops!) but most likely
-				// just a false positive.
+				// This is probably a false positive.
 				continue
 			}
 

targets/esp8266.ld

@@ -57,8 +57,8 @@ SECTIONS
     } >IRAM
 }
 
-_globals_start = ALIGN(_sdata, 4);
-_globals_end = ALIGN(_ebss, 4);
+_globals_start = _sdata;
+_globals_end = _ebss;
 _heap_start = _ebss;
 _heap_end = ORIGIN(DRAM) + LENGTH(DRAM);