FetchQueue credit count fails for multi-uop vector inst

[ADI-ROXX]

Part of #290

adi@adi:~/Desktop/riscv-perf-model/debug/test$ ctest -R Vector_test_bug_fetchqueue_credit_overflow -V
...
208: Exception while running
208: total_valid_ != capacity(): FetchQueue: Queue is full: in file: '/home/adi/map/sparta/local-install/include/sparta/resources/Queue.hpp', on line: 703
208:   [out] Writing error dump file 'error-dump.dbg'
208:   [out] Debug state written to "error-dump.dbg"
208: terminate called after throwing an instance of 'sparta::SpartaException'
208:   what():  total_valid_ != capacity(): FetchQueue: Queue is full: in file: '/home/adi/map/sparta/local-install/include/sparta/resources/Queue.hpp', on line: 703
208: Received Signal 6 (Aborted), address is 0x3e80004c719 from (nil)
208: ( 1) /home/adi/Desktop/riscv-perf-model/debug/test/core/vector/Vector_test(+0x921500) [0xb53e62851500]

Cause of this error:

When decode converts a single vector ins to multi-uop, it returns incorrect number of credits to fetch. This cause the above error.

Reproduction

Working test:

[
  { "mnemonic": "vsetivli", "rd": 0, "imm": 16, "vtype": "0x12", "vl": 16, "vta": 1 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 }
]

Failing test

[
  { "mnemonic": "vsetivli", "rd": 0, "imm": 16, "vtype": "0x12", "vl": 16, "vta": 1 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 },
  { "mnemonic": "vfwmacc.vv", "vd": 0, "vs1": 4, "vs2": 8 }
]

You can see that the commands are the same, just that in the failing test, the number is large.