Support 64bit HLSL atomic functions (#3957)

Resolves #3951

This adds a few atomic functions for SM6.6.
The spec can be found from here:
https://microsoft.github.io/DirectX-Specs/d3d/HLSL_SM_6_6_Int64_and_Float_Atomics.html

The new functions are:
void InterlockedAdd(inout XXX dest, in int64_t value, out int64_t original_value);
void InterlockedAdd(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedAnd(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedOr(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedXor(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedMin(inout XXX dest, in int64_t value, out int64_t original_value);
void InterlockedMin(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedMax(inout XXX dest, in int64_t value, out int64_t original_value);
void InterlockedMax(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedExchange(inout XXX dest, in float value, out float original_value);
void InterlockedExchange(inout XXX dest, in int64_t value, out int64_t original_value);
void InterlockedExchange(inout XXX dest, in uint64_t value, out uint64_t original_value);
void InterlockedCompareStore(inout XXX dest, in int64_t compare_value, in int64_t value);
void InterlockedCompareStore(inout XXX dest, in uint64_t compare_value, in uint64_t value);
void InterlockedCompareStoreFloatBitwise(inout XXX dest, in float compare_value, in float value);
void InterlockedCompareExchange(inout XXX dest, in int64_t compare_value, in int64_t value, out int64_t original_value);
void InterlockedCompareExchange(inout XXX dest, in uint64_t compare_value, in uint64_t value, out uint64_t original_value);
void InterlockedCompareExchangeFloatBitwise(inout XXX dest, in float compare_value, in float value, out float original_value);

void RWByteAddressBuffer::InterlockedAnd64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedOr64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedXor64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedMin64(in uint dest_offset, in int64_t value, out int64_t original_value);
void RWByteAddressBuffer::InterlockedMin64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedMax64(in uint dest_offset, in int64_t value, out int64_t original_value);
void RWByteAddressBuffer::InterlockedMax64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedExchangeFloat(in uint dest_offset, in float value, out float original_value);
void RWByteAddressBuffer::InterlockedExchange64(in uint dest_offset, in int64_t value, out int64_t original_value);
void RWByteAddressBuffer::InterlockedExchange64(in uint dest_offset, in uint64_t value, out uint64_t original_value);
void RWByteAddressBuffer::InterlockedCompareStore64(in uint dest_offset, in int64_t compare_value, in int64_t value);
void RWByteAddressBuffer::InterlockedCompareStore64(in uint dest_offset, in uint64_t compare_value, in uint64_t value);
void RWByteAddressBuffer::InterlockedCompareStoreFloatBitwise(in uint dest_offset, in float compare_value, in float value);
void RWByteAddressBuffer::InterlockedCompareExchangeFloatBitwise(in uint dest_offset, in float compare_value, in float value, out float original_value);

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