[Metal] Metal unsupported 64 bit wave op when using WaveReadLaneAt

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WaveReadLaneAt for 64 bit inputs is not supported on Metal.
Error result: `metal-shaderconverter: [callSIMDOp:6529] Fatal: Unsupported 64bit wave op`

Source:
```
[numthreads(4,1,1)]
void main(uint32_t3 TID : SV_GroupThreadID) {
uint OutIdx = TID.x * 3;

// Int
OutInt[OutIdx] = WaveReadLaneAt(InInt[TID.x], TID.x);
uint64_t4 ThreadInInt = {InInt[TID.x].xyz, InInt[TID.x].w};
OutInt[OutIdx + 1] = WaveReadLaneAt(ThreadInInt, TID.x);;
OutInt[OutIdx + 2].xy = WaveReadLaneAt(InInt[TID.x].xy, TID.x);

// UInt
OutUInt[OutIdx] = WaveReadLaneAt(InUInt[TID.x], TID.x);
int64_t4 ThreadInUInt = {InUInt[TID.x].xyz, InUInt[TID.x].w};
OutUInt[OutIdx + 1] = WaveReadLaneAt(ThreadInUInt, TID.x);;
OutUInt[OutIdx + 2].xy = WaveReadLaneAt(InUInt[TID.x].xy, TID.x);
}

# RUN: split-file %s %t
# RUN: %dxc_target -T cs_6_5 -Fo %t.o %t/source.hlsl
# RUN: %offloader %t/pipeline.yaml %t.o

```

Start by running the inline HLSL reproduction with the shown dxc_target and offloader commands, then inspect the callSIMDOp:6529 failure in the Metal shader conversion path. Done means the WaveReadLaneAt cases using 64-bit int and uint inputs no longer produce the unsupported 64bit wave op error and the offloader run succeeds.

Written by the indexing model from the issue text.