PPC: [turbofan] Change way OFF_HEAP_TARGET reloc info is omitted

Port 0f5a0719

Original Commit Message:

    This CL reverts commit 38bec2ea and
    implements the same functionality via Assembler::RecordRelocInfo.

R=sigurds@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I5a6d65bb2cc7cdaf1b982b3fb05cbb01b2099db2
Reviewed-on: https://chromium-review.googlesource.com/1110154Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#53948}

src/ppc/assembler-ppc.h

@@ -1453,10 +1453,10 @@ class Assembler : public AssemblerBase {
   void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
   ConstantPoolEntry::Access ConstantPoolAddEntry(RelocInfo::Mode rmode,
                                                  intptr_t value) {
-    bool sharing_ok =
-        RelocInfo::IsNone(rmode) || (!options().record_reloc_info_for_exrefs &&
-                                     RelocInfo::IsShareableRelocMode(rmode) &&
-                                     !is_constant_pool_entry_sharing_blocked());
+    bool sharing_ok = RelocInfo::IsNone(rmode) ||
+                      (!options().record_reloc_info_for_serialization &&
+                       RelocInfo::IsShareableRelocMode(rmode) &&
+                       !is_constant_pool_entry_sharing_blocked());
     return constant_pool_builder_.AddEntry(pc_offset(), value, sharing_ok);
   }
   ConstantPoolEntry::Access ConstantPoolAddEntry(Double value) {