[clang] [llvm] [RISCV][VLS] Support RISCV VLS calling convention (PR #100346)

[Matt Arsenault via cfe-commits]

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@@ -2281,6 +2282,9 @@ bool LLParser::parseOptionalCallingConv(unsigned &CC) {
   case lltok::kw_riscv_vector_cc:
     CC = CallingConv::RISCV_VectorCall;
     break;
+  case lltok::kw_riscv_vls_cc:
+    CC = CallingConv::RISCV_VLSCall;
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arsenm wrote:

needs IR assembler and bitcode compatibility tests 

https://github.com/llvm/llvm-project/pull/100346