[clang][llvm][SPIR-V] Explicitly encode native integer widths for SPIR-V (#110695) SPIR-V doesn't currently encode "native" integer bit-widths in its datalayout(s). This is problematic as it leads to optimisation passes, such as InstCombine, getting ideas and e.g. shrinking to non byte-multiple integer types, which is not desirable and can lead to breakage further down in the toolchain. This patch addresses that by encoding `i8`, `i16`, `i32` and `i64` as native types for vanilla SPIR-V (the spec natively supports them), and `i32` and `i64` for AMDGCNSPIRV (where the hardware targets are known). We also set the stack alignment on the latter, as it is overaligned (32-bit vs 8-bit).
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