Loom fails tobuild on linux x64

[Alan Bateman]

On 13/01/2020 00:01, forax at univ-mlv.fr wrote:
> good idea !
> https://travis-ci.org/forax/java-next/jobs/636110527#L2141
>
That's useful as it has the backtrace:

2170V  [libjvm.so+0x35de96] Label::patch_instructions(MacroAssembler*)+0x116
2171V  [libjvm.so+0x101c522] 
StubGenerator::generate_disjoint_word_copy_up(bool, char const*)+0x962
2172V  [libjvm.so+0x1026212] 
StubGenerator::generate_arraycopy_stubs()+0x2492
2173V  [libjvm.so+0x103c6b8]  StubGenerator::generate_all()+0x10a8
2174V  [libjvm.so+0x1017130]  StubGenerator_generate(CodeBuffer*, int)+0x60
2175V  [libjvm.so+0x103ef16]  StubRoutines::initialize2() [clone 
.part.18]+0xb6
2176V  [libjvm.so+0xb12e16]  init_globals()+0xf6
2177V  [libjvm.so+0x10c1db4]  Threads::create_vm(JavaVMInitArgs*, 
bool*)+0x374
2178V  [libjvm.so+0xbc36d6]  JNI_CreateJavaVM+0x56
2179C  [libjli.so+0x47c1]  JavaMain+0x81
2180C  [libjli.so+0x8929]  ThreadJavaMain+0x9

StubGenerator::generate_disjoint_word_copy_up generates the code to copy 
a continuation from the stack so it doesn't exist in the main line. 
There are several places where it uses jmpb and jccb that might be the 
issue with some UseAVX values. I'm sure Ron or Rickard will recognize 
this quickly.

-Alan.