ppc64: [baseline] fix register conflict

Change-Id: I65bf086579c51e7c73c25317952aa53919b07fa9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3687471
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80918}

src/builtins/ppc/builtins-ppc.cc

@@ -1738,7 +1738,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
     // Load the baseline code into the closure.
     __ mr(r5, kInterpreterBytecodeArrayRegister);
     static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
-    ReplaceClosureCodeWithOptimizedCode(masm, r5, closure, ip, r6);
+    ReplaceClosureCodeWithOptimizedCode(masm, r5, closure, ip, r7);
     __ JumpCodeObject(r5);
 
     __ bind(&install_baseline_code);