[clang] [AMDGPU] Treat printf as builtin for OpenCL (PR #72554)

[Vikram Hegde via cfe-commits]

================
@@ -406,5 +410,9 @@ TARGET_BUILTIN(__builtin_amdgcn_cvt_pk_fp8_f32, "iffiIb", "nc", "fp8-insts")
 TARGET_BUILTIN(__builtin_amdgcn_cvt_sr_bf8_f32, "ifiiIi", "nc", "fp8-insts")
 TARGET_BUILTIN(__builtin_amdgcn_cvt_sr_fp8_f32, "ifiiIi", "nc", "fp8-insts")
 
+// OpenCL
+LANGBUILTIN(printf, "icC*4.", "fp:0:", ALL_OCL_LANGUAGES)
----------------
vikramRH wrote:

OpenCL spec says printf format string should be in constant address space. This makes the printf signature target specific and hence we would need a target specific builtinID to recognize this. Im not sure I understand how we can go ahead with generic "BIPrinf" here ?

https://github.com/llvm/llvm-project/pull/72554