[lld] [WebAssembly] Fix issues combining coop threads and PIC (PR #208332)

[Sam Clegg via llvm-commits]

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@@ -445,12 +445,18 @@ bool InputChunk::generateRelocationCode(raw_ostream &os) const {
       continue;
     }
 
-    uint64_t offset = getVA(rel.Offset) - getInputSectionOffset();
+    // Calculate the address at which to apply the relocation. Note that PIC TLS
+    // segments are handled slightly differently here because at runtime they're
+    // a relative offset from `__tls_base`.
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sbc100 wrote:

There is already some logic in `DefinedData::getVA` that I think is supposed to handle this.   Maybe that should be extended instead of adding a special case here?

https://github.com/llvm/llvm-project/pull/208332