Rollup merge of #77961 - glandium:embed-bitcode, r=nagisa

Set .llvmbc and .llvmcmd sections as allocatable

This marks both sections as allocatable rather than excluded, which matches what
clang does with the equivalent `-fembed-bitcode` flag.

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -936,8 +936,8 @@ unsafe fn embed_bitcode(
         llvm::LLVMRustAppendModuleInlineAsm(llmod, asm.as_ptr().cast(), asm.len());
     } else {
         let asm = "
-            .section .llvmbc,\"e\"
-            .section .llvmcmd,\"e\"
+            .section .llvmbc,\"a\"
+            .section .llvmcmd,\"a\"
         ";
         llvm::LLVMRustAppendModuleInlineAsm(llmod, asm.as_ptr().cast(), asm.len());
     }