fix: lookup classes using existing thread context instead of vm

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	fix-class-lookups
Testbed	Linux

⚠️ WARNING: No Threshold found!

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Benchmark	Latency	nanoseconds (ns)
default_class_loader	📈 view plot ⚠️ NO THRESHOLD	7,195,500.00 ns
from_bytes	📈 view plot ⚠️ NO THRESHOLD	31,876.00 ns
hello_world	📈 view plot ⚠️ NO THRESHOLD	174,140,000.00 ns
load_hash_map	📈 view plot ⚠️ NO THRESHOLD	378.92 ns
load_invalid_class	📈 view plot ⚠️ NO THRESHOLD	29,952.00 ns
to_bytes	📈 view plot ⚠️ NO THRESHOLD	17,747.00 ns
to_string	📈 view plot ⚠️ NO THRESHOLD	125,550.00 ns
verify	📈 view plot ⚠️ NO THRESHOLD	732.60 ns
vm_init	📈 view plot ⚠️ NO THRESHOLD	167,260,000.00 ns

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[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 16 lines in your changes missing coverage. Please review.

Project coverage is 96.23%. Comparing base (3c7ca27) to head (97ea0d8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ristretto_vm/src/instruction/invokedynamic.rs	0.00%	10 Missing ⚠️
..._vm/src/intrinsic_methods/java/lang/classloader.rs	0.00%	4 Missing ⚠️
ristretto_vm/src/instruction/exception.rs	0.00%	1 Missing ⚠️
.../intrinsic_methods/java/lang/processenvironment.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
- Coverage   96.24%   96.23%   -0.01%     
==========================================
  Files         566      566              
  Lines       58530    58531       +1     
==========================================
- Hits        56331    56329       -2     
- Misses       2199     2202       +3     

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