llvm-wrapper: fix warning C4244

llvm-wrapper/RustWrapper.cpp(1234): warning C4244: '=': conversion from 'uint64_t' to 'unsigned int', possible loss of data
nice consistency:

uint64_t 6009708b43/llvm/include/llvm/IR/DiagnosticInfo.h (L172)
but unsigned 6009708b43/llvm/include/llvm/IR/DiagnosticInfo.h (L1091)

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -36,7 +36,7 @@ use rustc_span::InnerSpan;
 use rustc_target::spec::{CodeModel, RelocModel, SanitizerSet, SplitDebuginfo, TlsModel};
 
 use crate::llvm::diagnostic::OptimizationDiagnosticKind;
-use libc::{c_char, c_int, c_uint, c_void, size_t};
+use libc::{c_char, c_int, c_void, size_t};
 use std::ffi::CString;
 use std::fs;
 use std::io::{self, Write};
@@ -406,7 +406,7 @@ fn report_inline_asm(
     cgcx: &CodegenContext<LlvmCodegenBackend>,
     msg: String,
     level: llvm::DiagnosticLevel,
-    mut cookie: c_uint,
+    mut cookie: u64,
     source: Option<(String, Vec<InnerSpan>)>,
 ) {
     // In LTO build we may get srcloc values from other crates which are invalid
@@ -420,7 +420,7 @@ fn report_inline_asm(
         llvm::DiagnosticLevel::Warning => Level::Warning,
         llvm::DiagnosticLevel::Note | llvm::DiagnosticLevel::Remark => Level::Note,
     };
-    cgcx.diag_emitter.inline_asm_error(cookie as u32, msg, level, source);
+    cgcx.diag_emitter.inline_asm_error(cookie.try_into().unwrap(), msg, level, source);
 }
 
 unsafe extern "C" fn diagnostic_handler(info: &DiagnosticInfo, user: *mut c_void) {

compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs

@@ -123,7 +123,7 @@ impl SrcMgrDiagnostic {
 #[derive(Clone)]
 pub struct InlineAsmDiagnostic {
     pub level: super::DiagnosticLevel,
-    pub cookie: c_uint,
+    pub cookie: u64,
     pub message: String,
     pub source: Option<(String, Vec<InnerSpan>)>,
 }
@@ -149,7 +149,7 @@ impl InlineAsmDiagnostic {
         let smdiag = SrcMgrDiagnostic::unpack(super::LLVMRustGetSMDiagnostic(di, &mut cookie));
         InlineAsmDiagnostic {
             level: smdiag.level,
-            cookie,
+            cookie: cookie.into(),
             message: smdiag.message,
             source: smdiag.source,
         }

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -2254,7 +2254,7 @@ extern "C" {
     pub fn LLVMRustUnpackInlineAsmDiagnostic<'a>(
         DI: &'a DiagnosticInfo,
         level_out: &mut DiagnosticLevel,
-        cookie_out: &mut c_uint,
+        cookie_out: &mut u64,
         message_out: &mut Option<&'a Twine>,
     );
 

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1225,7 +1225,7 @@ enum class LLVMRustDiagnosticLevel {
 extern "C" void
 LLVMRustUnpackInlineAsmDiagnostic(LLVMDiagnosticInfoRef DI,
                                   LLVMRustDiagnosticLevel *LevelOut,
-                                  unsigned *CookieOut,
+                                  uint64_t *CookieOut,
                                   LLVMTwineRef *MessageOut) {
   // Undefined to call this not on an inline assembly diagnostic!
   llvm::DiagnosticInfoInlineAsm *IA =