[clang] [llvm] [Clang][RISCV] Move getVScaleRange logic into libLLVMFrontendDriver. NFC (PR #77327)

[Luke Lau via cfe-commits]

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@@ -2,6 +2,7 @@ set(LLVM_LINK_COMPONENTS
   Support
   TargetParser
   FrontendOpenMP
+  FrontendDriver
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lukel97 wrote:

I think the issue with llvmFrontendDriver specifically is that this code wouldn't be called from any of the drivers, it would be called from clangBasic and flangFrontend respectively. Could we create something like llvmFrontendSupport or similar?

https://github.com/llvm/llvm-project/pull/77327