Mark back::lto::optimize_thin_module and back::write::codegen` functions as safe

Author: GuillaumeGomez

src/back/lto.rs

@@ -589,7 +589,7 @@ fn thin_lto(
     Ok((opt_jobs, copy_jobs))
 }
 
-pub unsafe fn optimize_thin_module(
+pub fn optimize_thin_module(
     thin_module: ThinModule<GccCodegenBackend>,
     _cgcx: &CodegenContext<GccCodegenBackend>,
 ) -> Result<ModuleCodegen<GccContext>, FatalError> {

src/back/write.rs

@@ -14,7 +14,7 @@ use crate::base::add_pic_option;
 use crate::errors::CopyBitcode;
 use crate::{GccCodegenBackend, GccContext};
 
-pub(crate) unsafe fn codegen(
+pub(crate) fn codegen(
     cgcx: &CodegenContext<GccCodegenBackend>,
     dcx: DiagCtxtHandle<'_>,
     module: ModuleCodegen<GccContext>,

src/lib.rs

@@ -413,7 +413,7 @@ impl WriteBackendMethods for GccCodegenBackend {
         cgcx: &CodegenContext<Self>,
         thin: ThinModule<Self>,
     ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
-        unsafe { back::lto::optimize_thin_module(thin, cgcx) }
+        back::lto::optimize_thin_module(thin, cgcx)
     }
 
     unsafe fn codegen(
@@ -422,7 +422,7 @@ impl WriteBackendMethods for GccCodegenBackend {
         module: ModuleCodegen<Self::Module>,
         config: &ModuleConfig,
     ) -> Result<CompiledModule, FatalError> {
-        unsafe { back::write::codegen(cgcx, dcx, module, config) }
+        back::write::codegen(cgcx, dcx, module, config)
     }
 
     fn prepare_thin(