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

runtime/vm/instructions_arm64_test.cc

Index: runtime/vm/instructions_arm64_test.cc
diff --git a/runtime/vm/instructions_arm64_test.cc b/runtime/vm/instructions_arm64_test.cc
index 2d556fa2ab9571c0601784b7045f514272d7a5d4..c44b40bc9196df7d4b7320404121beba1e85a12c 100644
--- a/runtime/vm/instructions_arm64_test.cc
+++ b/runtime/vm/instructions_arm64_test.cc
@@ -16,6 +16,8 @@ namespace dart {
 #define __ assembler->
 
 ASSEMBLER_TEST_GENERATE(Call, assembler) {
+  // Code accessing pp is generated, but not executed. Uninitialized pp is OK.
+  __ set_constant_pool_allowed(true);
   __ BranchLinkPatchable(&StubCode::InvokeDartCodeLabel());
   __ ret();
 }