[llvm] [RISCV][SLEEF]: Support SLEEF vector library for RISC-V target. (PR #114014)

[Mikhail R. Gadelha via llvm-commits]

mikhailramalho wrote:

@mga-sc I'm trying to run some experiments with your PR and will post as soon as they are done, but can I ask you to add the following code to your PR? So that clang can accept -fveclib=SLEEF when building for riscv64
```
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 0952262c3601..04f4f0522618 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5804,7 +5804,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
             << Name << Triple.getArchName();
     } else if (Name == "SLEEF" || Name == "ArmPL") {
       if (Triple.getArch() != llvm::Triple::aarch64 &&
-          Triple.getArch() != llvm::Triple::aarch64_be)
+          Triple.getArch() != llvm::Triple::aarch64_be &&
+          Triple.getArch() != llvm::Triple::riscv64)
         D.Diag(diag::err_drv_unsupported_opt_for_target)
             << Name << Triple.getArchName();
     }
```

https://github.com/llvm/llvm-project/pull/114014