MC/Mach-O: Also set the PCrel bit in the second half of paired relocation entries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98081 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 84dda6d..b3e8114 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -489,13 +489,11 @@
     Relocs.push_back(MRE);
 
     if (Type == RIT_LocalDifference) {
-      Type = RIT_Pair;
-
       MachRelocationEntry MRE;
       MRE.Word0 = ((0         <<  0) |
-                   (Type      << 24) |
+                   (RIT_Pair  << 24) |
                    (Log2Size  << 28) |
-                   (0   << 30) |
+                   (IsPCRel   << 30) |
                    RF_Scattered);
       MRE.Word1 = Value2;
       Relocs.push_back(MRE);