Improve WMOPS Performance of ivas_param_mc_param_est_enc_fx() step 1

Basic info

ivas_param_mc_param_est_enc_fx() is using slow additions inside nested for loops. Some of them can be replaced by faster 64 bit additions.

• Float reference:
  • Encoder (float):
  • Decoder (float):
• Fixed point:
  • Encoder (fixed):
  • Decoder (fixed):

Bug description

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-xxxx