[flang] fix flang builds with clang 20 after #100692 (#106718)

#100692 changes clang template deduction, and an error was now emitted
when building flang with top of the tree clang when mapping std::pow in
intrinsics-library.cpp for constant folding `error: address of
overloaded function 'pow' is ambiguous`

See https://lab.llvm.org/buildbot/#/builders/4/builds/1670

I I am not expert enough to understand if the new error is justified or
not here, but it is easy to help the compiler here with explicit
wrappers to fix the builds.

0 files changed, 0 insertions, 0 deletions