MIPS32: Fill branch delay slots

Test: booted MIPS32 in QEMU
Test: test-art-host-gtest
Test: test-art-target-gtest
Test: test-art-target-run-test-optimizing on CI20

Change-Id: I727e80753395ab99fff004cb5d2e0a06409150d7
diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index 0d3f849..b0de964 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -753,7 +753,7 @@
   }
 
   // Collect PC infos for the mapping table.
-  uint32_t native_pc = GetAssembler()->CodeSize();
+  uint32_t native_pc = GetAssembler()->CodePosition();
 
   if (instruction == nullptr) {
     // For stack overflow checks and native-debug-info entries without dex register