[PowerPC][NFC] Merged two switch entries.

Two switch entries did exactly the same thing. This patch merges them.

Author: stefanp-synopsys

lld/ELF/Arch/PPC64.cpp

@@ -1259,17 +1259,7 @@ void PPC64::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
   case R_PPC64_DTPREL64:
     write64(loc, val - dynamicThreadPointerOffset);
     break;
-  case R_PPC64_PCREL34: {
-    const uint64_t si0Mask = 0x00000003ffff0000;
-    const uint64_t si1Mask = 0x000000000000ffff;
-    const uint64_t fullMask = 0x0003ffff0000ffff;
-    checkInt(loc, val, 34, rel);
-
-    uint64_t instr = readPrefixedInstruction(loc) & ~fullMask;
-    writePrefixedInstruction(loc, instr | ((val & si0Mask) << 16) |
-                             (val & si1Mask));
-    break;
-  }
+  case R_PPC64_PCREL34:
   case R_PPC64_GOT_PCREL34:
   case R_PPC64_GOT_TPREL_PCREL34:
   case R_PPC64_TPREL34: {