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cache: load factor is definitionally always < 1

--- a/cache.c

+++ b/cache.c

@@ -1,8 +1,11 @@

 #include <u.h>

 #include <libc.h>

-#pragma pack on

+// This is designed to run with a maximum load factor < 1,

+// and does not support resizing; there is NO EVICTION MECHANISM.

+// Insertion when at 100% capacity is definitionally user error.

+#pragma pack on

 typedef struct {

 	Lock;

 	// arena-local block index | arena index << 16

@@ -151,6 +154,8 @@

 			return 1;

 		}

 	}

-	sysfatal("TODO: support eviction");

+	fprint(2, "impossible\n");

+	// DO NOT PROCEED if the cache might be corrupt!

+	abort();

 	return 0;

 }