Rename kDummy32BitOffset to kPlaceholder32BitOffset.

And drop an obsolete reference to Quick compiler.

Test: m test-art-host-gtest
Bug: 161336379
Change-Id: If08cc0ca83cfeb1c6923c41f9d61766f878a295a
diff --git a/compiler/optimizing/intrinsics_x86.cc b/compiler/optimizing/intrinsics_x86.cc
index 15ac627..2bad0b5 100644
--- a/compiler/optimizing/intrinsics_x86.cc
+++ b/compiler/optimizing/intrinsics_x86.cc
@@ -2977,7 +2977,8 @@
       DCHECK(method_address != nullptr);
       Register method_address_reg =
           invoke->GetLocations()->InAt(method_address_index).AsRegister<Register>();
-      __ movl(out, Address(method_address_reg, out, TIMES_4, CodeGeneratorX86::kDummy32BitOffset));
+      __ movl(out,
+              Address(method_address_reg, out, TIMES_4, CodeGeneratorX86::kPlaceholder32BitOffset));
       codegen_->RecordBootImageIntrinsicPatch(method_address, info.array_data_boot_image_reference);
     } else {
       // Note: We're about to clobber the index in `out`, so we need to use `in` and