[WebAssembly] Fix relocation count in wasm binaries with call_indirect

[sbc100]

Summary

This bug was found when trying to build the gcc torture tests with the wasm backend.

We don't yes have in-tree tests for the wasm MC layer.

[dschuff]

Are we able to have tests for these kinds of things yet or do we need more yaml/objdump/etc support still?

[sbc100]

Yes, I believe we are now in a position to write tests for this stuff, but I've not looked into the details yet, and would rather not block this minor fix on that larger change.

llvm/trunk/lib/MC/WasmObjectWriter.cpp

#endif
   // for descriptions of the reloc sections.
 
   // === Code Reloc Section ====================================================
   if (!CodeRelocations.empty()) {
     startSection(Section, wasm::WASM_SEC_CUSTOM, "reloc.CODE");
 
     encodeULEB128(wasm::WASM_SEC_CODE, getStream());
 
-    encodeULEB128(CodeRelocations.size(), getStream());
+    encodeULEB128(CodeRelocations.size() + TypeIndexFixups.size(), getStream());
 
     WriteRelocations(CodeRelocations, getStream(), SymbolIndices);
     WriteTypeRelocations(TypeIndexFixups, TypeIndexFixupTypes, getStream());
 
     endSection(Section);
   }
 
   // === Data Reloc Section ====================================================