[mlir][ptr] Add translations to LLVMIR for ptr ops. (#156355)
Implements translation from ptr dialect to LLVM IR for core pointer
operations:
- `ptr.ptr_add` -> `getelementptr`
- `ptr.load` -> `load` with atomic ordering, volatility, and metadata
support
- `ptr.store` -> `store` with atomic ordering, volatility, and metadata
support
- `ptr.type_offset` -> GEP-based size computation
Example:
```mlir
llvm.func @test(%arg0: !ptr.ptr<#llvm.address_space<0>>) {
%0 = ptr.type_offset f64 : i32
%1 = ptr.ptr_add inbounds %arg0, %0 : !ptr.ptr<#llvm.address_space<0>>, i32
%2 = ptr.load volatile %1 : !ptr.ptr<#llvm.address_space<0>> -> f64
ptr.store %2, %arg0 : f64, !ptr.ptr<#llvm.address_space<0>>
llvm.return
}
```
Translates to:
```llvm
define void @test(ptr %0) {
%2 = getelementptr inbounds i8, ptr %0, i32 8
%3 = load volatile double, ptr %2, align 8
store double %3, ptr %0, align 8
ret void
}
```
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