TLB: Deduplicate down to one OptimizationBarrier per TLBEntry

[ingallsj]

Related issue: After 228498d, the TLBEntry.getData(vpn) function creates a new OptimizationBarrier module each time it is called, three times per entry. This results in more generated Verilog submodules with the same inputs:

OptimizationBarrier ppn_data_barrier(_1..15)
OptimizationBarrier entries_barrier(_1..15)
OptimizationBarrier normal_entries_barrier(_1..15)

Type of change: other enhancement

Impact: no functional change

Call the TLBEntry.getData(vpn) function once per entry per search request port, then pass that result as an argument to other functions. This deduplicates the above to these generated Verilog submodules:

OptimizationBarrier entries_barrier(_1..23)

This reduces the TLB Verilog generated lines by a third.

Development Phase: implementation

Release Notes