Skip acquiring block-lock in BumpPointerSpace::AllocThreadUnsafe

Using it causes lock-level violation with JNI global reference table
lock. The purpose of the usage is anyways not too important.

Test: art/test/testrunner/run_build_test_target.py -j80 art-gtest-ss-gc
Bug: 160737021
Change-Id: I1042fdd1ffc9a6354ce8f628f0f5baec0d7cc0df
diff --git a/runtime/gc/space/bump_pointer_space-inl.h b/runtime/gc/space/bump_pointer_space-inl.h
index 41f2f7d..2774b9e 100644
--- a/runtime/gc/space/bump_pointer_space-inl.h
+++ b/runtime/gc/space/bump_pointer_space-inl.h
@@ -45,14 +45,6 @@
                                                            size_t* bytes_allocated,
                                                            size_t* usable_size,
                                                            size_t* bytes_tl_bulk_allocated) {
-  {
-    // We don't create blocks for these allocations. So confirm that we are still
-    // operating on the main-block.
-    // TODO: If the assertion fails, then start associating
-    // each allocation here to a new block.
-    MutexLock mu(self, block_lock_);
-    CHECK(block_sizes_.empty());
-  }
   Locks::mutator_lock_->AssertExclusiveHeld(self);
   num_bytes = RoundUp(num_bytes, kAlignment);
   uint8_t* end = end_.load(std::memory_order_relaxed);
diff --git a/runtime/gc/space/bump_pointer_space.h b/runtime/gc/space/bump_pointer_space.h
index acea382..bba1711 100644
--- a/runtime/gc/space/bump_pointer_space.h
+++ b/runtime/gc/space/bump_pointer_space.h
@@ -59,7 +59,7 @@
   // Thread-unsafe allocation for when mutators are suspended, used by the semispace collector.
   mirror::Object* AllocThreadUnsafe(Thread* self, size_t num_bytes, size_t* bytes_allocated,
                                     size_t* usable_size, size_t* bytes_tl_bulk_allocated)
-      override REQUIRES(Locks::mutator_lock_, !block_lock_);
+      override REQUIRES(Locks::mutator_lock_);
 
   mirror::Object* AllocNonvirtual(size_t num_bytes);
   mirror::Object* AllocNonvirtualWithoutAccounting(size_t num_bytes);