Improve WMOPS performance of tcx_ltp_synth_filter32()
# Basic info
The function tcx_ltp_synth_filter32() has IF() inside FOR() loops.
<!--- Add commit SHA used to reproduce -->
- 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
<!-- Commandline or script -->
```bash
```
<!--- Below are labels that will be added but are not shown in description. This is a template to help fill them.
Add further information to the first row and remove and add labels as necessary. -->
issue