[clang] [Clang][OpenCL][AMDGPU] Allow a kernel to call another kernel (PR #115821)

[Aniket Lal via cfe-commits]

lalaniket8 wrote:

> > this change makes sense and it doesn't bring (known to me) regressions
> 
> Actually, there is an incorrect behavior in the following test case: https://godbolt.org/z/dc3T7Mo3G , note __clang_ocl_kern_imp_sample_kernel_float was generated, but was never called. @lalaniket8 can this be addressed?

The call was placed and inlined since -O2 optimization flag was passed. Default inlining happens with -O1 and  higher flags. 
You can change it to -O0 and see the call to `__clang_ocl_kern_imp_sample_kernel_float`.

https://github.com/llvm/llvm-project/pull/115821