[PATCH] D125947: [RISCV] Add default ABI for archs with only F extension

[Wang Pengcheng via Phabricator via cfe-commits]

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It seems that we use ilp32/lp64 ABI for these archs with
only single-precision floating-point extension. I believe
that users would like to pass arguments by floating-point
registers if they provide F extension in -march. So here
we use ilp32f and lp64f for these cases.

For some existed tests, we set `-target-abi` explicitly
to keep consistent.

@benshi001 has proposed this before and I think it is
necessary.

Links:

- https://reviews.llvm.org/D103878
- https://github.com/riscv-non-isa/riscv-toolchain-conventions/issues/13


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125947

Files:
  clang/test/CodeGen/RISCV/riscv-metadata.c
  clang/test/Driver/riscv-abi.c
  clang/test/Driver/riscv-cpus.c
  llvm/lib/Support/RISCVISAInfo.cpp
  llvm/test/CodeGen/RISCV/callee-saved-fpr32s.ll
  llvm/test/CodeGen/RISCV/calling-conv-half.ll
  llvm/test/CodeGen/RISCV/calling-conv-rv32f-ilp32.ll
  llvm/test/CodeGen/RISCV/calling-conv-vector-float.ll
  llvm/test/CodeGen/RISCV/codemodel-lowering.ll
  llvm/test/CodeGen/RISCV/float-bitmanip-dagcombines.ll
  llvm/test/CodeGen/RISCV/half-bitmanip-dagcombines.ll
  llvm/test/CodeGen/RISCV/half-fcmp.ll
  llvm/test/CodeGen/RISCV/rv64f-float-convert-strict.ll
  llvm/test/CodeGen/RISCV/rv64f-float-convert.ll

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