Rollup merge of #138872 - a4lg:riscv-fix-incompatible-abi-zfinx, r=workingjubilee

rustc_target: RISC-V `Zfinx` is incompatible with `{ILP32,LP64}[FD]` ABIs

Because RISC-V Calling Conventions note that:

> This means code targeting the `Zfinx` extension always uses the ILP32,  ILP32E or LP64 integer calling-convention only ABIs as there is no dedicated hardware floating-point register file.

`{ILP32,LP64}[FD]` ABIs with hardware floating-point calling conventions are incompatible with the `Zfinx` extension.

This commit adds `"zfinx"` to the incompatible feature list to those ABIs and tests whether trying to add `"zdinx"` (that is analogous to `"zfinx"` but in double-precision) on a LP64D ABI configuration results in an error (it also tests extension implication; `Zdinx` requires `Zfinx` extension).

Links: RISC-V psABI specification version 1.0
<https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/v1.0/riscv-cc.adoc#named-abis>
<https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/tag/v1.0>

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