[PowerPC] Fix incorrect symbol name of frexp libcall (#71626)

frexpl is for ppc_fp128. The correct symbol name for f128 is frexpf128.

Author: ecnelises

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

@@ -1427,6 +1427,7 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
   setLibcallName(RTLIB::LLRINT_F128, "llrintf128");
   setLibcallName(RTLIB::NEARBYINT_F128, "nearbyintf128");
   setLibcallName(RTLIB::FMA_F128, "fmaf128");
+  setLibcallName(RTLIB::FREXP_F128, "frexpf128");
 
   if (Subtarget.isAIXABI()) {
     setLibcallName(RTLIB::MEMCPY, isPPC64 ? "___memmove64" : "___memmove");

llvm/test/CodeGen/PowerPC/f128-arith.ll

@@ -1320,7 +1320,7 @@ define dso_local fp128 @qpFREXP(ptr %a, ptr %b) {
 ; CHECK-NEXT:    addi r5, r1, 44
 ; CHECK-NEXT:    mr r30, r4
 ; CHECK-NEXT:    lxv v2, 0(r3)
-; CHECK-NEXT:    bl frexpl
+; CHECK-NEXT:    bl frexpf128
 ; CHECK-NEXT:    nop
 ; CHECK-NEXT:    lwz r3, 44(r1)
 ; CHECK-NEXT:    stw r3, 0(r30)
@@ -1343,7 +1343,7 @@ define dso_local fp128 @qpFREXP(ptr %a, ptr %b) {
 ; CHECK-P8-NEXT:    mr r30, r4
 ; CHECK-P8-NEXT:    lxvd2x vs0, 0, r3
 ; CHECK-P8-NEXT:    xxswapd v2, vs0
-; CHECK-P8-NEXT:    bl frexpl
+; CHECK-P8-NEXT:    bl frexpf128
 ; CHECK-P8-NEXT:    nop
 ; CHECK-P8-NEXT:    lwz r3, 44(r1)
 ; CHECK-P8-NEXT:    stw r3, 0(r30)