Test largest valid initial and max size for memory64 in memory64.wast (WebAssembly#106)

Author: evicy

test/core/memory64.wast

@@ -5,6 +5,8 @@
 (module (memory i64 0 1))
 (module (memory i64 1 256))
 (module (memory i64 0 65536))
+(module (memory i64 0x1_0000_0000_0000))
+(module (memory i64 0 0x1_0000_0000_0000))
 
 (module (memory i64 (data)) (func (export "memsize") (result i64) (memory.size)))
 (assert_return (invoke "memsize") (i64.const 0))