PPC: [fullcode][mips][mips64][ppc][s390] Avoid trashing of a home object when...

PPC: [fullcode][mips][mips64][ppc][s390] Avoid trashing of a home object when doing a keyed store to a super.

Port 43aee033

    Fixed minor typo in ppc file.

R=ishell@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=chromium:625590
LOG=N

Review-Url: https://codereview.chromium.org/2125933002
Cr-Commit-Position: refs/heads/master@{#37562}

src/full-codegen/ppc/full-codegen-ppc.cc

@@ -1665,7 +1665,7 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
       PushOperand(result_register());
       if (expr->is_compound()) {
         const Register scratch1 = r5;
-        const Register scratch = r4;
+        const Register scratch2 = r4;
         __ LoadP(scratch1, MemOperand(sp, 2 * kPointerSize));
         __ LoadP(scratch2, MemOperand(sp, 1 * kPointerSize));
         PushOperands(scratch1, scratch2, result_register());