libclc: no constant/generic variants of math functions like frexp

[djdeath]

The frexp function has 3 variants in the current libclc : https://github.com/llvm/llvm-project/blob/main/libclc/generic/include/clc/math/frexp.inc : global, local, private

The SPIR specification page 17 says that are 5 different address space qualifiers :

• 0 – private
• 1 – global
• 2 – constant
• 3 – local
• 4 – generic

If some SPIR module was generated using the generic address space qualifier, what version should it use from libclc?
Should the constant & generic variant of the existing functions be added to libclc?

[gfxstrand]

There should really be generic versions of them all as well, IMO. It shouldn't take much work as there's already a macro to generate the three versions that are there today.