[RISCV] Minor code cleanups in RISCVISAInfo. NFCI
authorCraig Topper <craig.topper@sifive.com>
Wed, 26 Jan 2022 20:50:38 +0000 (12:50 -0800)
committerCraig Topper <craig.topper@sifive.com>
Wed, 26 Jan 2022 21:35:40 +0000 (13:35 -0800)
commit7e73fd95a0ee5fa05f3426068a9f709853b24e54
treeb9a2618006cd4c286c82773f1434f1c615a34cef
parent6bc20eb13470514c67e9ee5bbd515c2197ce8ea8
[RISCV] Minor code cleanups in RISCVISAInfo. NFCI

Pass StringRef by value instead of const reference.

Replace if () llvm_unreachable with an assert.

Replace size() == 0 with empty()
llvm/lib/Support/RISCVISAInfo.cpp