Report any section overflows at the end of assembly (#1482)

* Report any section overflows at the end of assembly

* Immediately handle overflow of the 32-bit size counter

include/asm/section.hpp

@@ -78,6 +78,8 @@ uint32_t sect_GetOutputOffset();
 uint32_t sect_GetAlignBytes(uint8_t alignment, uint16_t offset);
 void sect_AlignPC(uint8_t alignment, uint16_t offset);
 
+void sect_CheckSizes();
+
 void sect_StartUnion();
 void sect_NextUnionMember();
 void sect_EndUnion();