[mlir][AMDGPU] Set ABI version constant when linking device libs

Currently, linking the device libraries requires setting a constant
that indicates the code object ABI version the compilation is
targeting.

This fixes the MLIR linking process by setting this constant to 400,
which is the value corresponding to the current code object ABI
default, version 4.

Reviewed By: Mogball

Differential Revision: https://reviews.llvm.org/D126913

mlir/lib/Dialect/GPU/Transforms/SerializeToHsaco.cpp

@@ -262,6 +262,10 @@ SerializeToHsacoPass::translateToLLVMIR(llvm::LLVMContext &llvmContext) {
                          .getZExtValue();
     uint32_t isaNumber = minor + 1000 * major;
     addControlConstant("__oclc_ISA_version", isaNumber, 32);
+
+    // This constant must always match the default code object ABI version
+    // of the AMDGPU backend.
+    addControlConstant("__oclc_ABI_version", 400, 32);
   }
 
   // Determine libraries we need to link - order matters due to dependencies