Revert "Pass new pool pointer to the JumpToException stub instead of reloading in through the frame…

runtime/vm/stub_code_arm64.cc

Index: runtime/vm/stub_code_arm64.cc
diff --git a/runtime/vm/stub_code_arm64.cc b/runtime/vm/stub_code_arm64.cc
index 8ab898b35ddc20554a2af5ef82959fb96fc76e41..6d97d6abf649235e108d24eada08fec119ab1585 100644
--- a/runtime/vm/stub_code_arm64.cc
+++ b/runtime/vm/stub_code_arm64.cc
@@ -1879,7 +1879,6 @@ void StubCode::GenerateGetStackPointerStub(Assembler* assembler) {
 // R3: error object.
 // R4: address of stacktrace object.
 // R5: thread.
-// R6: pool pointer.
 // Does not return.
 void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
   ASSERT(kExceptionObjectReg == R0);
@@ -1890,13 +1889,14 @@ void StubCode::GenerateJumpToExceptionHandlerStub(Assembler* assembler) {
   __ mov(R0, R3);  // Exception object.
   __ mov(R1, R4);  // StackTrace object.
   __ mov(THR, R5);
-  // When in the PP register, the pool pointer is untagged.
-  __ sub(PP, R6, Operand(kHeapObjectTag));
   // Set the tag.
   __ LoadImmediate(R2, VMTag::kDartTagId);
   __ StoreToOffset(R2, THR, Thread::vm_tag_offset());
   // Clear top exit frame.
   __ StoreToOffset(ZR, THR, Thread::top_exit_frame_info_offset());
+  // Restore the pool pointer.
+  __ RestoreCodePointer();
+  __ LoadPoolPointer();
   __ ret();  // Jump to the exception handler code.
 }