Update LLVM and add Unsupported diagnostic

Secure entry functions do not support if arguments are passed on the
stack. An "unsupported" diagnostic will be emitted by LLVM if that is
the case.
This commits adds support in Rust for that diagnostic so that an error
will be output if that is the case!

Signed-off-by: Hugues de Valon <hugues.devalon@arm.com>

Author: hug-dev

Diff for: compiler/rustc_codegen_llvm/src/back/write.rs

@@ -344,6 +344,13 @@ unsafe extern "C" fn diagnostic_handler(info: &DiagnosticInfo, user: *mut c_void
             .expect("non-UTF8 diagnostic");
             diag_handler.warn(&msg);
         }
+        llvm::diagnostic::Unsupported(diagnostic_ref) => {
+            let msg = llvm::build_string(|s| {
+                llvm::LLVMRustWriteDiagnosticInfoToString(diagnostic_ref, s)
+            })
+            .expect("non-UTF8 diagnostic");
+            diag_handler.err(&msg);
+        }
         llvm::diagnostic::UnknownDiagnostic(..) => {}
     }
 }

Diff for: compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs

@@ -118,6 +118,7 @@ pub enum Diagnostic<'ll> {
     InlineAsm(InlineAsmDiagnostic<'ll>),
     PGO(&'ll DiagnosticInfo),
     Linker(&'ll DiagnosticInfo),
+    Unsupported(&'ll DiagnosticInfo),
 
     /// LLVM has other types that we do not wrap here.
     UnknownDiagnostic(&'ll DiagnosticInfo),
@@ -159,6 +160,7 @@ impl Diagnostic<'ll> {
 
             Dk::PGOProfile => PGO(di),
             Dk::Linker => Linker(di),
+            Dk::Unsupported => Unsupported(di),
 
             _ => UnknownDiagnostic(di),
         }

Diff for: compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -483,6 +483,7 @@ pub enum DiagnosticKind {
     OptimizationFailure,
     PGOProfile,
     Linker,
+    Unsupported,
 }
 
 /// LLVMRustDiagnosticLevel

Diff for: compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1171,6 +1171,7 @@ enum class LLVMRustDiagnosticKind {
   OptimizationFailure,
   PGOProfile,
   Linker,
+  Unsupported,
 };
 
 static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
@@ -1197,6 +1198,8 @@ static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
     return LLVMRustDiagnosticKind::PGOProfile;
   case DK_Linker:
     return LLVMRustDiagnosticKind::Linker;
+  case DK_Unsupported:
+    return LLVMRustDiagnosticKind::Unsupported;
   default:
     return (Kind >= DK_FirstRemark && Kind <= DK_LastRemark)
                ? LLVMRustDiagnosticKind::OptimizationRemarkOther