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

[Matt Arsenault via cfe-commits]

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@@ -170,20 +173,46 @@ static Value *appendString(IRBuilder<> &Builder, Value *Desc, Value *Arg,
   return callAppendStringN(Builder, Desc, Arg, Length, IsLast);
 }
 
+static Value *appendVectorArg(IRBuilder<> &Builder, Value *Desc, Value *Arg,
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arsenm wrote:

All of the codegen changes here should be a separate commit 

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