force all os_malloc calls to request a aligned size.

- this fix Fatal exception (9) by unaligned class memory

cores/esp8266/abi.cpp

@@ -26,10 +26,12 @@ extern "C" {
 }
 
 void *operator new(size_t size) {
+    size = ((size + 3) & ~((size_t)0x3));
     return os_malloc(size);
 }
 
 void *operator new[](size_t size) {
+    size = ((size + 3) & ~((size_t)0x3));
     return os_malloc(size);
 }
 

cores/esp8266/libc_replacements.c

@@ -38,6 +38,7 @@
 #include "user_interface.h"
 
 void* malloc(size_t size) {
+    size = ((size + 3) & ~((size_t)0x3));
     return os_malloc(size);
 }
 
@@ -46,6 +47,7 @@ void free(void* ptr) {
 }
 
 void* realloc(void* ptr, size_t size) {
+    size = ((size + 3) & ~((size_t)0x3));
     return os_realloc(ptr, size);
 }