Fix JDWP interception to work if debug names are missing. #2479
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We currently lookup an argument to one of the breakpointed methods by name. However, if the debug info is stripped, the names returned by the JVM debugger are all the empty string. This change makes it possible to look for arguments by index as well. This depends on the fact that the Android debugger always labels the "this" argument with a name[0] and that the arguments are stored in successive slots in the DEX[1].
[0] libdexfile/dex/dex_file-inl.h:236
[1] libdexfile/dex/dex_file-inl.h:254+