Rollup merge of rust-lang#53740 - japaric:readobj, r=alexcrichton

add llvm-readobj to llvm-tools-preview

Similar to readelf but supports more object formats (it seems). Particularly useful to inspect in detail sections (e.g. their flags) and symbols (e.g. their types).

r? @alexcrichton
cc @dvc94ch

src/bootstrap/lib.rs

@@ -211,6 +211,7 @@ const LLVM_TOOLS: &[&str] = &[
     "llvm-objcopy", // used to transform ELFs into binary format which flashing tools consume
     "llvm-objdump", // used to disassemble programs
     "llvm-profdata", // used to inspect and merge files generated by profiles
+    "llvm-readobj", // used to get information from ELFs/objects that the other tools don't provide
     "llvm-size", // used to prints the size of the linker sections of a program
     "llvm-strip", // used to discard symbols from binary files to reduce their size
 ];