Update torch-mlir to llvm/torch-mlir@f42c7e4 (#19736)

Also carries temp patch
<https://github.com/iree-org/torch-mlir/commit/2debe153979956e1bb21cb260a7bbbbe6f43dbe0>
from <https://github.com/iree-org/iree/pull/19683>.

Signed-off-by: zjgarvey <zjgarvey@gmail.com>

third_party/torch-mlir

diff --git a/third_party/torch-mlir b/third_party/torch-mlir
index 2debe15..a6ae057 160000
--- a/third_party/torch-mlir
+++ b/third_party/torch-mlir
@@ -1 +1 @@
-Subproject commit 2debe153979956e1bb21cb260a7bbbbe6f43dbe0
+Subproject commit a6ae057c1e0b21b14fd5387b50066a39e2ed0a31