[lld] [LLD][COFF] Use EC load config for ARM64X relocations of load config directory (PR #121337)

[Jacek Caban via llvm-commits]

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@@ -835,18 +835,30 @@ class ECExportThunkChunk : public NonSectionCodeChunk {
   Defined *target;
 };
 
+// ARM64X relocation value, potentially relative to a symbol.
+class Arm64XRelocVal {
+public:
+  Arm64XRelocVal(int64_t value = 0) : value(value) {}
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cjacek wrote:

I changed argument type to `uint64_t`. Negative values are possible to delta values, but the cast may just as well happen on the call. Thanks!

https://github.com/llvm/llvm-project/pull/121337