Simplify constant pool usage in arm64 code generator (by removing extra argument

runtime/vm/runtime_entry_arm64.cc

Index: runtime/vm/runtime_entry_arm64.cc
diff --git a/runtime/vm/runtime_entry_arm64.cc b/runtime/vm/runtime_entry_arm64.cc
index b0aad2395f78aa2c057fc0cd25e7975cc3d805be..7d35375b095f622e6a642457b8d1a2f674541f90 100644
--- a/runtime/vm/runtime_entry_arm64.cc
+++ b/runtime/vm/runtime_entry_arm64.cc
@@ -49,15 +49,15 @@ void RuntimeEntry::Call(Assembler* assembler, intptr_t argument_count) const {
     __ mov(R26, SP);
     __ ReserveAlignedFrameSpace(0);
     __ mov(CSP, SP);
-    __ BranchLink(&label, kNoPP);
+    __ BranchLink(&label);
     __ mov(SP, R26);
     __ mov(CSP, R25);
   } else {
     // Argument count is not checked here, but in the runtime entry for a more
     // informative error message.
-    __ LoadExternalLabel(R5, &label, kNotPatchable, PP);
-    __ LoadImmediate(R4, argument_count, kNoPP);
-    __ BranchLink(&StubCode::CallToRuntimeLabel(), PP);
+    __ LoadExternalLabel(R5, &label);
+    __ LoadImmediate(R4, argument_count);
+    __ BranchLink(&StubCode::CallToRuntimeLabel());
   }
 }