[llvm] [HWASAN] NFC? Remove DW_OP_LLVM_tag_offset from DIExpression::isImplicit (PR #79816)

[J. Ryan Stinnett via llvm-commits]

jryans wrote:

> I think in all these cases it is a mistake to treat an expression containing only a `DW_OP_LLVM_tag_offset` opcode as "implicit (which this patch fixes).

I agree with your analysis above. `DW_OP_LLVM_tag_offset` does not make the expression become a value instead of location, which seems to be what `isImplicit` is testing. So, this change seems correct to me.

https://github.com/llvm/llvm-project/pull/79816