Fix for AIESW-45264

[snigdha-gupta]

• funcs_by_elf used to map a stripped kernel name to a single AIEFunction. When one ELF contained two kernels with the same base name, the last write won, so later stamps looking up that name got the wrong start PC and armed the breakpoint at the wrong address.
• We now map the stripped kernel name to a list of AIEFunctions.
• If there is more than one candidate, _pick_instantiation runs both stamp.name (mladf) and func.name (ELF) through _template_key, which reduces each name so the two sources spell identically. It looks the layer's reduced name up in that dict and returns the matching AIEFunction.
• We then copy that candidate's start/end PCs onto the stamp.
• The full demangled string cannot be the dict key: mladf and objdump -C spell the same instantiation differently ('\x01' vs 1; defaulted type args omitted vs filled in).
• A miss still skips that stamp only, same as before.