[CIR] Add additional NYI checks for SVE builtins (#175575)
This change extends the NYI checks recently introduced in #174433 by
adding further validation of SVE builtin type modifiers. For example:
```cpp
SVETypeFlags typeFlags(builtinIntrInfo->typeModifier);
// Unsupported flag — bail out
if (typeFlags.someFlag())
cgm.errorNYI();
```
The newly added checks mirror the logic in
CodeGen/TargetBuiltins/ARM.cpp, specifically in:
* `CodeGenFunction::EmitAArch64SVEBuiltinExpr`,
which defines the default code-generation path for SVE builtins.
This change helps ensure CIR rejects unsupported cases early and
provides skeleton for future PRs in which we will be adding support for
the missing builtins.
