[WebAssembly] Fix element segments in wasm64 object files (#94617)

Followup to #94487

Author: sbc100

llvm/lib/MC/WasmObjectWriter.cpp

@@ -1022,7 +1022,8 @@ void WasmObjectWriter::writeElemSection(
     encodeULEB128(TableNumber, W->OS); // the table number
 
   // init expr for starting offset
-  W->OS << char(wasm::WASM_OPCODE_I32_CONST);
+  W->OS << char(is64Bit() ? wasm::WASM_OPCODE_I64_CONST
+                          : wasm::WASM_OPCODE_I32_CONST);
   encodeSLEB128(InitialTableOffset, W->OS);
   W->OS << char(wasm::WASM_OPCODE_END);
 

llvm/test/MC/WebAssembly/reloc-pic64.s

@@ -110,7 +110,7 @@ hidden_func:
 # CHECK-NEXT:   - Type:            ELEM
 # CHECK-NEXT:     Segments:
 # CHECK-NEXT:        Offset:
-# CHECK-NEXT:          Opcode:          I32_CONST
+# CHECK-NEXT:          Opcode:          I64_CONST
 # CHECK-NEXT:          Value:           1
 # CHECK-NEXT:        Functions:       [ 5 ]
 # CHECK-NEXT:   - Type:            DATACOUNT