Issue #3057: RawSymbolId should have been 32 bits not 64 bits
Issue #3057: RawSymbolId should have been 32 bits not 64 bits

The largest known test case 'BlackParrot' registers around 36864 symbols
which is roughly about 1/3 of the maximum that the cache supports.
Regardless, cache only supports a maximum of 20 bits (i.e. 1048575) for
SymbolId and so 64 bits is unnecessary.

chipsalliance/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,alainmarcel/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,alainmarcel/Surelog,chipsalliance/Surelog