ppc: allow MemOp offset to be 64 bit

Change-Id: I1d743994115e659d3f6bf0ce17938b40d1467e5f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3144914Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76696}

src/codegen/ppc/assembler-ppc.cc

@@ -187,13 +187,13 @@ Operand Operand::EmbeddedStringConstant(const StringConstantBase* str) {
   return result;
 }
 
-MemOperand::MemOperand(Register rn, int32_t offset)
+MemOperand::MemOperand(Register rn, int64_t offset)
     : ra_(rn), offset_(offset), rb_(no_reg) {}
 
 MemOperand::MemOperand(Register ra, Register rb)
     : ra_(ra), offset_(0), rb_(rb) {}
 
-MemOperand::MemOperand(Register ra, Register rb, int32_t offset)
+MemOperand::MemOperand(Register ra, Register rb, int64_t offset)
     : ra_(ra), offset_(offset), rb_(rb) {}
 
 void Assembler::AllocateAndInstallRequestedHeapObjects(Isolate* isolate) {

src/codegen/ppc/assembler-ppc.h

@@ -133,13 +133,13 @@ class V8_EXPORT_PRIVATE Operand {
 // Alternatively we can have a 16bit signed value immediate
 class V8_EXPORT_PRIVATE MemOperand {
  public:
-  explicit MemOperand(Register rn, int32_t offset = 0);
+  explicit MemOperand(Register rn, int64_t offset = 0);
 
   explicit MemOperand(Register ra, Register rb);
 
-  explicit MemOperand(Register ra, Register rb, int32_t offset);
+  explicit MemOperand(Register ra, Register rb, int64_t offset);
 
-  int32_t offset() const { return offset_; }
+  int64_t offset() const { return offset_; }
 
   // PowerPC - base register
   Register ra() const { return ra_; }
@@ -148,7 +148,7 @@ class V8_EXPORT_PRIVATE MemOperand {
 
  private:
   Register ra_;     // base
-  int32_t offset_;  // offset
+  int64_t offset_;  // offset
   Register rb_;     // index
 
   friend class Assembler;