[clang] [Multilib] Extend support for -fmultilib-flag to RISC-V (PR #182220)

[Peter Smith via cfe-commits]

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@@ -378,6 +374,8 @@ ToolChain::getMultilibFlags(const llvm::opt::ArgList &Args) const {
     break;
   }
 
+  processMultilibCustomFlags(Result, Args);
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smithp35 wrote:

This will extend support for -fmultilib-flag to all targets supported by  the bare-metal driver and not just Arm, AArch64 and RISCV.

I don't think this is necessarily a bad thing, but we should update the description and title to say extend support to all targets.

https://github.com/llvm/llvm-project/pull/182220