Add spec tests for table maximum >=2^32 (WebAssembly#102)

The table maximum is now a 64-bit values, so test that we actually
support values outside the 32-bit range.

Author: backes

test/core/table.wast

@@ -53,6 +53,8 @@
 (module (table i64 1 256 funcref))
 (module (table i64 0 65536 funcref))
 (module (table i64 0 0xffff_ffff funcref))
+(module (table i64 0 0x1_0000_0000 funcref))
+(module (table i64 0 0xffff_ffff_ffff_ffff funcref))
 
 (module (table i64 0 funcref) (table i64 0 funcref))
 (module (table (import "spectest" "table64") i64 0 funcref) (table i64 0 funcref))