[llvm] [Object][COFF][NFC] Introduce Arm64ECThunkType enum. (PR #85936)

[Jacek Caban via llvm-commits]

================
@@ -806,6 +806,12 @@ enum Feat00Flags : uint32_t {
   Kernel = 0x40000000,
 };
 
+enum class Arm64ECThunkType : uint32_t {
----------------
cjacek wrote:

I changed it, thanks. I wasn't sure about that, it occupies 32 bits in `.hybmp` entry, but only 8 of them are valid.

https://github.com/llvm/llvm-project/pull/85936