[clang] [llvm] [AMDGPU] Enable OpenCL hostcall printf (WIP) (PR #72556)

[Vikram Hegde via cfe-commits]

vikramRH wrote:

The new set of changes adds following changes,
1. The iteration over vector elements now happens using vector size from the format specifier as reference, this is inline with runtime implementation and helps handling undefined behavior when we have a mismatch.
2. The error flag "-Werror=format-invalid-specifier" has been removed.

https://github.com/llvm/llvm-project/pull/72556