[libclc] [libclc] Move sign to the CLC builtins library (PR #115699)

[Karol Herbst via cfe-commits]

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@@ -322,22 +322,26 @@ foreach( t ${LIBCLC_TARGETS_TO_BUILD} )
 
     if ( ARCH STREQUAL spirv OR ARCH STREQUAL spirv64 )
       set( build_flags -O0 -finline-hint-functions -DCLC_SPIRV )
-      set( opt_flags )
+      set( clc_opt_flags )
+      # Inline CLC functions into OpenCL builtins
+      set( opencl_opt_flags "--passes=always-inline" )
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karolherbst wrote:

yeah, as long as the OpenCL C builtins aren't inlined into the implementations of other builtins (e.g. a builtin implemented using `fma`) we are fine with any internal inlining, just want to keep the calls to OpenCL C builtins there.

And one thing I forgot to mention is, that we rely on the function name mangling to do our custom function lookup/linking, but I guess this won't be touched by any of this here.

https://github.com/llvm/llvm-project/pull/115699