jaotc: unexpected long compile time for a 3012-byte generated class

[Tianxiao Gu]

Hi All,

I found some abnormal behavior of jaotc. It takes *23* minutes for
jaotc (head) to compile a 3012-byte generated class file (C0.class)
and jaotc ends with a fatal error. I have managed to reproduce this issue
on my machine for 4 times.

Related files are hosted on Google Drive:

https://drive.google.com/open?id=1u9O3uPkvucX6PWQkMFER3NAUWIR_KglE

Reproducing Steps:

jaotc --output C0.so C0.class

Environment:

`java --version`

openjdk 10-internal 2018-03-20
> OpenJDK Runtime Environment (build 10-internal+0-adhoc.t.jdk)
> OpenJDK 64-Bit Server VM (build 10-internal+0-adhoc.t.jdk, mixed mode)


`lscpu`

Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                8
> On-line CPU(s) list:   0-7
> Thread(s) per core:    2
> Core(s) per socket:    4
> Socket(s):             1
> NUMA node(s):          1
> Vendor ID:             GenuineIntel
> CPU family:            6
> Model:                 158
> Model name:            Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
> Stepping:              9
> CPU MHz:               900.000
> CPU max MHz:           4200.0000
> CPU min MHz:           800.0000
> BogoMIPS:              7200.00
> Virtualization:        VT-x
> L1d cache:             32K
> L1i cache:             32K
> L2 cache:              256K
> L3 cache:              8192K
> NUMA node0 CPU(s):     0-7
> Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
> pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
> rep_good nopl xtopology nonstop_tsc aperfmperf tsc_known_freq pni pclmulqdq
> dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid
> sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c
> rdrand lahf_lm abm 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority
> ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx
> rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat
> pln pts hwp hwp_notify hwp_act_window hwp_epp


`uname -a`

Linux xtiger 4.10.0-42-generic #46~16.04.1-Ubuntu SMP Mon Dec 4 15:57:59
> UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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