ART: Change return types of field access entrypoints

Ensure that return types guarantee full-width data as the compiled
code and mterp expect by using size_t and ssize_t.

This fixes Clang no longer sign-/zero-extending small return types.

Bug: 30232671
Test: m ART_TEST_RUN_TEST_NDEBUG=true ART_TEST_INTERPRETER=true test-art-host-run-test
Change-Id: Ic505befc6c94e2dccbc8abf2b13d4c2d662e68d1
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 1aa7b54..3d12aed 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -316,7 +316,7 @@
                                  instruction_->GetDexPc(),
                                  this);
       CheckEntrypointTypes<
-          kQuickInstanceofNonTrivial, uint32_t, const mirror::Class*, const mirror::Class*>();
+          kQuickInstanceofNonTrivial, size_t, const mirror::Class*, const mirror::Class*>();
       arm_codegen->Move32(locations->Out(), Location::RegisterLocation(R0));
     } else {
       DCHECK(instruction_->IsCheckCast());