Missing load/store categories for some AARCH64 instructions

[edeiana]

Some AARCH64 instructions that perform read/write operations are missing their corresponding load/store categories (DR_INSTR_CATEGORY_LOAD, DR_INSTR_CATEGORY_STORE).
For example:

13127323    10416044:        7446 ifetch       4 byte(s) @ 0x0000aaaaefe73500 88eb7dac   casa   %w11 %w12 (%x13)[4byte] -> %w11 (%x13)[4byte]
13127324    10416044:        7446 read         4 byte(s) @ 0x0000115cffc33ba0 by PC 0x0000aaaaefe73500
13127325    10416044:        7446 write        4 byte(s) @ 0x0000115cffc33ba0 by PC 0x0000aaaaefe73500

Performs a read and write operation, hence it should have both load and store categories.

However, hacking the view_tool to print the categories for this instructions reveals that only the load category (printed right before the casa opcode) is set:

13127323    10416044:        7446 ifetch       4 byte(s) @ 0x0000aaaaefe73500 88eb7dac   load casa   %w11 %w12 (%x13)[4byte] -> %w11 (%x13)[4byte]
13127324    10416044:        7446 read         4 byte(s) @ 0x0000115cffc33ba0 by PC 0x0000aaaaefe73500
13127325    10416044:        7446 write        4 byte(s) @ 0x0000115cffc33ba0 by PC 0x0000aaaaefe73500

This is likely a bug in decode_load_store_category() in core/ir/aarch64/codec.c.

We have not observed this issue in x86 instructions.