[llvm] [ELF] Add support for CREL to getSectionAndRelocations (PR #126445)

[Aiden Grossman via llvm-commits]

================
@@ -747,6 +747,13 @@ decodeBBAddrMapImpl(const ELFFile<ELFT> &EF,
     assert(RelaSec &&
            "Can't read a SHT_LLVM_BB_ADDR_MAP section in a relocatable "
            "object file without providing a relocation section.");
+    // We might end up with relocations in CREL here. If we do, return an
----------------
boomanaiden154 wrote:

Before this patch, we could not end up with CREL relocation sections in `decodeBBAddrMapImpl` (or the equivalent for the stack size section). After this patch we can, but the consumers do not yet properly handle CREL, which is why I've made them emit an error in this PR with followup PRs adding support.

https://github.com/llvm/llvm-project/pull/126445