[RISCV] Upgrade Zvfh version to 1.0 and move out of experimental state.

[craig.topper]

Summary

This has been ratified according to https://wiki.riscv.org/display/HOME/Recently+Ratified+Extensions

[asb]

Should add a release note as well, but otherwise LGTM. My understanding is that all of the intrinsics this exposes have the same level of stability / finalisation as the other vector intrinsics, but please let me know if I understand incorrectly.

[jrtc27]

Uh, why are there clang/test/Sema/aarch64* tests full of RISC-V extension names? That's not right at all. One of them is coming from https://reviews.llvm.org/D135011, I haven't traced the rest back, but that's clearly wrong. The test looks to be a copy of the RISC-V one with tweaks to change riscv(64) to arm/aarch64, and -target-feature +sve (with two spaces) added.

[craig.topper]

In D155668#4548454, @jrtc27 wrote:

Uh, why are there clang/test/Sema/aarch64* tests full of RISC-V extension names? That's not right at all. One of them is coming from https://reviews.llvm.org/D135011, I haven't traced the rest back, but that's clearly wrong. The test looks to be a copy of the RISC-V one with tweaks to change riscv(64) to arm/aarch64, and -target-feature +sve (with two spaces) added.

Fixed in 690edeab78ba6996a44f6fd9e8fce79cb78e7737