[llvm] [SPARC][Utilities] Add names for SPARC ELF flags in LLVM binary utilities (PR #102843)

[via llvm-commits]

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@@ -699,11 +699,19 @@ enum {
 
 // SPARC Specific e_flags
 enum : unsigned {
+  // ELF extension mask.
+  // All values are available for EM_SPARC32PLUS & EM_SPARCV9 objects, except
+  // EF_SPARC_32PLUS which is a EM_SPARC32PLUS-only flag.
+  //
+  // Note that those features are not mutually exclusive (one can set more than
+  // one flag in this group).
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koachan wrote:

My understanding is that most flags under one mask group (like `EF_RISCV_FLOAT_ABI_*` or `EF_AVR_ARCH_*` or our own `EF_SPARCV9_*`) is intended to be mutually exclusive choices, no?
Which is the opposite of how `EF_SPARC_*` group works, which is why I feel like it's worth noting.

https://github.com/llvm/llvm-project/pull/102843