Auto merge of #38542 - YaLTeR:fastcall-fix, r=pnkfelix

Fix fastcall not applying inreg attributes to arguments

Fixes https://github.com/rust-lang/rust/issues/18086

1 files changed, 2 insertions, 0 deletions

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index f5fa66f1b0e..5d5845213e2 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -150,6 +150,8 @@ from_rust(LLVMRustAttribute kind) {
       return Attribute::UWTable;
     case ZExt:
       return Attribute::ZExt;
+    case InReg:
+      return Attribute::InReg;
     default:
       llvm_unreachable("bad AttributeKind");
   }