[llvm] [SPIRV] Add trig function lowering (PR #95973)

[Thorsten Schütt via llvm-commits]

================
@@ -592,8 +592,8 @@ G_FLOG, G_FLOG2, G_FLOG10
 
 Calculate the base-e, base-2, or base-10 respectively.
----------------
tschuett wrote:

The comment is confusing.

https://github.com/llvm/llvm-project/pull/95973