[PATCH] D150417: [LoongArch] Move lp64s out of the unimplemented calling conv list

[Lu Weining via Phabricator via llvm-commits]

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lp64s is same as lp64d execpt that floating point arguments and return
values are always passed via GPRs or stack which means `UseGPRForFloat`
is always `true` in `CC_LoongArch` for lp64s.

One motivation of this change is to build linux which uses
`-msoft-float` and `-mabi=lp64s` [1].

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/loongarch/Makefile?h=v6.4-rc1#n49


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150417

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/test/CodeGen/LoongArch/calling-conv-lp64d.ll
  llvm/test/CodeGen/LoongArch/calling-conv-lp64s-lp64d-common.ll
  llvm/test/CodeGen/LoongArch/calling-conv-lp64s.ll
  llvm/test/CodeGen/LoongArch/e_flags.ll

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