FEXCore: Support CpuState relative vector named constants

The motivation towards just having a pointer array in CpuState was that
initialization was fairly cheap and that we have limited space inside
the encoding depending on what we want to do.

Initialization cost is still a concern but doing a memcpy of 128-bytes
isn't that big of a deal.

Limited space in CpuState, while a concern isn't a significant one.
   - Needs to currently be less than 1 page in size
   - Needs to be under the architectural offset limitations of loadstore
     scaled offsets. Which is 65KB for 128-bit vectors

Still keeps the pointer array around for cases when we would need
synthesize an address offset and it's just easier to load the
process-wide table.

The performance improvement here is removing the dependency in the
ldr+ldr chain. In microbenchmarks this has shown to have an improvement
of ~4% by removing this dependency chain on Cortex-X1C.

FEXCore/include/FEXCore/Core/CoreState.h

@@ -259,6 +259,9 @@ namespace FEXCore::Core {
       uint64_t L1Pointer{};
       uint64_t L2Pointer{};
       /**  @} */
+
+      // Copy of process-wide named vector constants data.
+      alignas(16) uint64_t NamedVectorConstants[FEXCore::IR::NamedVectorConstant::NAMED_VECTOR_CONST_POOL_MAX][2];
     } Common;
 
     union {