Remove leftover bootstrap workaround - difference in readint's flags …

…field

When implementing endian switching for (read|write)u?int I discovered
that I needed 2 bits for encoding endianness information. To get through
NQP's bootstrap I temorarily took an unset endianness flat to signify
the old 1 bit interpretation of the flags field. Apparently I forgot to
remove the workaround in readuint's JIT implementation.

Many thanks to timotimo++ for the discovery!

src/jit/graph.c

@@ -2472,7 +2472,7 @@ static MVMint32 consume_ins(MVMThreadContext *tc, MVMJitGraph *jg,
         MVMSpeshFacts *facts = MVM_spesh_get_facts(tc, jg->sg, ins->operands[3]);
         if (facts->flags & MVM_SPESH_FACT_KNOWN_VALUE) {
             if ((facts->value.i & 3) != MVM_SWITCHENDIAN) {
-                unsigned char const size  = 1 << (facts->value.i >> ((facts->value.i & 1) ? 2 : 1));
+                unsigned char const size  = 1 << (facts->value.i >> 2);
 
                 MVMSpeshFacts *type_facts = MVM_spesh_get_facts(tc, jg->sg, ins->operands[0]);
                 if (type_facts && type_facts->flags & MVM_SPESH_FACT_KNOWN_TYPE && type_facts->type &&