Handle synthetic method parameters entries that don't have names

> If the value of the name_index item is zero, then this parameters element indicates a formal parameter with no name.

https://docs.oracle.com/javase/specs/jvms/se20/html/jvms-4.html#jvms-4.7.24

PiperOrigin-RevId: 530356139

Issue: FP3-A13#318
Bug: 350689588
Test: go/prebuilt-drop-local-testing
Change-Id: I3f5235c90dfbadc4abc90cf2f9516de96211ad63
(cherry picked from commit 612ede47a5d2bf0d23796959d147678cc42b71bd)
2 files changed