Post-parse call devirtualization (JDK-8257211) converts virtual calls to static calls which allows an inline type receiver to be passed as fields and the corresponding buffer allocation to become useless.

Currently, the inline type nodes created during that optimization and also such useless buffer allocations are not removed, leading to missed optimization opportunities and asserts like below.

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/oracle/valhalla2/open/src/hotspot/share/opto/compile.cpp:4104), pid=2752650, tid=2752665
# assert(false) failed: inline type node was not removed

Current CompileTask:
C2: 3704 1217 b 4 compiler.valhalla.inlinetypes.TestLWorld::test150 (54 bytes)

Stack: [0x00007fab1783a000,0x00007fab1793b000], sp=0x00007fab17935fa0, free space=1007k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xa3db26] Compile::final_graph_reshaping_main_switch(Node*, Final_Reshape_Counts&, unsigned int)+0x496
V [libjvm.so+0xa3f3c5] Compile::final_graph_reshaping_impl(Node*, Final_Reshape_Counts&) [clone .part.0]+0x85
V [libjvm.so+0xa3fac8] Compile::final_graph_reshaping_walk(Node_Stack&, Node*, Final_Reshape_Counts&)+0x138
V [libjvm.so+0xa4c011] Compile::final_graph_reshaping()+0x331
V [libjvm.so+0xa5214a] Compile::Optimize()+0x193a
V [libjvm.so+0xa53890] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, bool, DirectiveSet*)+0x1630
V [libjvm.so+0x844640] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x6a0
V [libjvm.so+0xa639f1] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xd31
V [libjvm.so+0xa64728] CompileBroker::compiler_thread_loop()+0x598
V [libjvm.so+0x1966a1c] JavaThread::thread_main_inner()+0x27c
V [libjvm.so+0x196d040] Thread::call_run()+0x100
V [libjvm.so+0x161dfa4] thread_native_entry(Thread*)+0x104