Categorize dispatch name better for linalg.generic cases (#16677)

This could be quite useful for viewing trace captures.

tools/test/executable_sources.mlir

diff --git a/tools/test/executable_sources.mlir b/tools/test/executable_sources.mlir
index 30e305e..df5fa94 100644
--- a/tools/test/executable_sources.mlir
+++ b/tools/test/executable_sources.mlir
@@ -39,4 +39,4 @@
 // CHECK: IR Dump Before SerializeExecutablesPass
 // CHECK: hal.executable public @abs_dispatch_0
 // CHECK:   hal.executable.variant public @vmvx_bytecode_fb
-// CHECK:     vm.func private @abs_dispatch_0_generic
+// CHECK:     vm.func private @abs_dispatch_0_elementwise