[Interpreter] Fix bytecode offset for stack overflows.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index 3c8ace7d54f568e28d7445ae76e97fd0d2e26569..403f363fcbbc019ce7bdaae52b5474d4d5dc6cbc 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1025,8 +1025,12 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
     __ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
   }
 
-  // Push new.target, bytecode array and zero for bytecode array offset.
-  __ li(r3, Operand::Zero());
+  // Load initial bytecode offset.
+  __ mov(kInterpreterBytecodeOffsetRegister,
+         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
+
+  // Push new.target, bytecode array and Smi tagged bytecode array offset.
+  __ SmiTag(r3, kInterpreterBytecodeOffsetRegister);
   __ Push(r6, kInterpreterBytecodeArrayRegister, r3);
 
   // Allocate the local and temporary register file on the stack.
@@ -1057,12 +1061,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
     __ bind(&no_args);
   }
 
-  // Load accumulator, register file, bytecode offset, dispatch table into
-  // registers.
+  // Load accumulator and dispatch table into registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
-  __ addi(r7, fp, Operand(InterpreterFrameConstants::kRegisterFileFromFp));
-  __ mov(kInterpreterBytecodeOffsetRegister,
-         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ mov(kInterpreterDispatchTableRegister,
          Operand(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));