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[cc2] fix qbe alloc instruction alignment size

We didn't use qbe alignment requirements (4, 8, 16).
Align to it and allocate target size.

--- a/cc2/arch/qbe/code.c

+++ b/cc2/arch/qbe/code.c

@@ -302,7 +302,7 @@

 	extern Type ptrtype;

 	printf("\t%s =%s\talloc%lu\t%lu\n",

-	       symname(sym), size2asm(&ptrtype), tp->size, tp->align);

+	       symname(sym), size2asm(&ptrtype), tp->align+3 & ~3, tp->size );

 }

 void