Unrolled build for rust-lang#118142

Rollup merge of rust-lang#118142 - saethlin:llvm-linkage, r=tmiasko

Tighten up link attributes for llvm-wrapper bindings

Fixes rust-lang#118084 by moving all of the declarations of symbols from `llvm_rust` into a separate extern block with `#[link(name = "llvm-wrapper", kind = "static")]`.

This also renames `LLVMTimeTraceProfiler*` to `LLVMRustTimeTraceProfiler*` because those are functions from `llvm_rust`.

r? tmiasko

compiler/rustc_codegen_llvm/src/lib.rs

@@ -104,7 +104,7 @@ struct TimeTraceProfiler {
 impl TimeTraceProfiler {
     fn new(enabled: bool) -> Self {
         if enabled {
-            unsafe { llvm::LLVMTimeTraceProfilerInitialize() }
+            unsafe { llvm::LLVMRustTimeTraceProfilerInitialize() }
         }
         TimeTraceProfiler { enabled }
     }
@@ -113,7 +113,7 @@ impl TimeTraceProfiler {
 impl Drop for TimeTraceProfiler {
     fn drop(&mut self) {
         if self.enabled {
-            unsafe { llvm::LLVMTimeTraceProfilerFinishThread() }
+            unsafe { llvm::LLVMRustTimeTraceProfilerFinishThread() }
         }
     }
 }