[PowerPC] Emit libcall to frexpl for calls to frexp(ppcDoublDouble) (#75226)

On Linux PPC call lib func ``frexpl`` for calls to ``frexp()`` for input
of type PPCDoubleDouble.

Fixes bug: llvm/llvm-project#64426

NOKEYCHECK=True
GitOrigin-RevId: aaa3f72c1ce6e1757df79c0d02e0675201ee07a3

Author: lei137

test/libcxx/numerics/c.math/constexpr-cxx23-clang.pass.cpp

@@ -58,15 +58,9 @@ int main(int, char**) {
 
   ASSERT_NOT_CONSTEXPR_CXX23(std::frexp(0.0f, &DummyInt) == 0.0f);
   ASSERT_NOT_CONSTEXPR_CXX23(std::frexp(0.0, &DummyInt) == 0.0);
-//FIXME: currently linux powerpc does not support this expansion
-// since 0.0L lowers to ppcf128 and special handling is required.
-#if !defined(__LONG_DOUBLE_IBM128__)
   ASSERT_NOT_CONSTEXPR_CXX23(std::frexp(0.0L, &DummyInt) == 0.0L);
-#endif
   ASSERT_NOT_CONSTEXPR_CXX23(std::frexpf(0.0f, &DummyInt) == 0.0f);
-#if !defined(__LONG_DOUBLE_IBM128__)
   ASSERT_NOT_CONSTEXPR_CXX23(std::frexpl(0.0L, &DummyInt) == 0.0L);
-#endif
 
   ASSERT_NOT_CONSTEXPR_CXX23(std::ilogb(1.0f) == 0);
   ASSERT_NOT_CONSTEXPR_CXX23(std::ilogb(1.0) == 0);