PPC/s390: [ubsan] Port Code to the new design

Port fe61cd64

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

Change-Id: Idee62637817fea020f809772de96b43c2a39cadd
Reviewed-on: https://chromium-review.googlesource.com/c/1331832Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#57448}

src/ppc/assembler-ppc.cc

@@ -2087,7 +2087,7 @@ void Assembler::EmitRelocations() {
        it != relocations_.end(); it++) {
     RelocInfo::Mode rmode = it->rmode();
     Address pc = reinterpret_cast<Address>(buffer_) + it->position();
-    RelocInfo rinfo(pc, rmode, it->data(), nullptr);
+    RelocInfo rinfo(pc, rmode, it->data(), Code());
 
     // Fix up internal references now that they are guaranteed to be bound.
     if (RelocInfo::IsInternalReference(rmode)) {

src/s390/assembler-s390.cc

@@ -822,7 +822,7 @@ void Assembler::EmitRelocations() {
        it != relocations_.end(); it++) {
     RelocInfo::Mode rmode = it->rmode();
     Address pc = reinterpret_cast<Address>(buffer_) + it->position();
-    RelocInfo rinfo(pc, rmode, it->data(), nullptr);
+    RelocInfo rinfo(pc, rmode, it->data(), Code());
 
     // Fix up internal references now that they are guaranteed to be bound.
     if (RelocInfo::IsInternalReference(rmode)) {