Revert "[mlir][linalg] Introduce transpose semantic to 'linalg.matmul' ops. (#104783)"

This reverts commit 03483737a7 and
99c8557, which is a fix-up on top of the former.

I'm reverting because this commit broke two tests:
  mlir/test/python/integration/dialects/linalg/opsrun.py
  mlir/test/python/integration/dialects/transform.py
See https://lab.llvm.org/buildbot/#/builders/138/builds/4872

I'm not familiar with the tests, so I'm leaving it to the original author
to either remove or adapt the broken tests, as discussed here:
  https://github.com/llvm/llvm-project/pull/104783#issuecomment-2406390905

mlir/test/python/dialects/linalg/ops.py

@@ -84,6 +84,81 @@ def testNamedStructuredOpCustomForm():
 
     print(module)
 
+
+# CHECK-LABEL: TEST: testNamedStructuredOpGenericForm
+@run
+def testNamedStructuredOpGenericForm():
+    with Context() as ctx, Location.unknown():
+        module = Module.create()
+        f32 = F32Type.get()
+        with InsertionPoint(module.body):
+
+            @func.FuncOp.from_py_func(
+                RankedTensorType.get((4, 16), f32), RankedTensorType.get((16, 8), f32)
+            )
+            def named_form(lhs, rhs):
+                init_result = tensor.empty([4, 8], f32)
+                #      CHECK: "linalg.matmul"(%{{.*}})
+                # CHECK-SAME:    cast = #linalg.type_fn<cast_signed>
+                # CHECK-SAME:    operandSegmentSizes = array<i32: 2, 1>
+                # CHECK-NEXT:  ^bb0(%{{.*}}: f32, %{{.*}}: f32, %{{.*}}: f32):
+                # CHECK-NEXT:    arith.mulf{{.*}} (f32, f32) -> f32
+                # CHECK-NEXT:    arith.addf{{.*}} (f32, f32) -> f32
+                # CHECK-NEXT:    linalg.yield{{.*}} (f32) -> ()
+                # CHECK-NEXT: (tensor<4x16xf32>, tensor<16x8xf32>, tensor<4x8xf32>) -> tensor<4x8xf32>
+                return linalg.matmul(lhs, rhs, outs=[init_result])
+
+    module.operation.print(print_generic_op_form=True)
+
+
+# CHECK-LABEL: TEST: testNamedStructuredAsGenericOp
+@run
+def testNamedStructuredAsGenericOp():
+    with Context() as ctx, Location.unknown():
+        module = Module.create()
+        f32 = F32Type.get()
+        with InsertionPoint(module.body):
+
+            @func.FuncOp.from_py_func(
+                RankedTensorType.get((4, 16), f32), RankedTensorType.get((16, 8), f32)
+            )
+            def generic_form(lhs, rhs):
+                init_result = tensor.EmptyOp([4, 8], f32)
+                # CHECK: linalg.generic
+                return linalg.matmul(
+                    lhs, rhs, outs=[init_result.result], emit_generic=True
+                )
+
+    print(module)
+
+
+# CHECK-LABEL: TEST: testOpResultFromOtherOp
+@run
+def testOpResultFromOtherOp():
+    with Context(), Location.unknown():
+        module = Module.create()
+        f32 = F32Type.get()
+        with InsertionPoint(module.body):
+
+            @func.FuncOp.from_py_func(
+                RankedTensorType.get((4, 16), f32), RankedTensorType.get((16, 8), f32)
+            )
+            def pass_an_op_directly(arg0, arg1):
+                one = arith.ConstantOp(F32Type.get(), 1.0)
+                # CHECK: %[[LHS:.*]] = linalg.fill
+                lhs = linalg.fill(one, outs=[arg0])
+                # CHECK: %[[RHS:.*]] = linalg.fill
+                rhs = linalg.fill(one, outs=[arg1])
+                # CHECK: %[[INIT:.*]] = tensor.empty
+                init = tensor.EmptyOp([4, 8], f32)
+                # CHECK: linalg.matmul
+                # CHECK: ins(%[[LHS]], %[[RHS]]
+                # CHECK: outs(%[[INIT]]
+                return linalg.matmul(lhs, rhs, outs=init)
+
+    print(module)
+
+
 # CHECK-LABEL: TEST: testIdentityRegionOps
 @run
 def testIdentityRegionOps():