[mlir][bazel] Remove implementation from LinalgInterfaces target.

Move LinalgInterfaces.cpp from LinalgInterfaces to LinalgDialect target.

This allows TensorDialect to use header-only RelayoutOpInterface without introducing a hidden dependency on LinalgDialect (producing an `no-allow-shlib-undefined` error if a target depends on TensorDialect but not LinalgDialect).

Also reverts d64f177a2f because it's no longer needed.

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -11547,34 +11547,20 @@ cc_library(
 
 cc_library(
     name = "LinalgInterfaces",
-    srcs = [
-        "include/mlir/Dialect/Linalg/IR/Linalg.h",
-        "lib/Dialect/Linalg/IR/LinalgInterfaces.cpp",
-    ],
+    # Note: LinalgInterfaces.cpp is part of LinalgDialect, not this target.
+    # This allows TensorDialect to use the header-only RelayOpInterface without
+    # an implicit dependency on the LinalgDialect.
     hdrs = ["include/mlir/Dialect/Linalg/IR/LinalgInterfaces.h"],
     includes = ["include"],
     deps = [
-        ":AffineDialect",
-        ":ArithDialect",
-        ":ArithUtils",
-        ":BytecodeOpInterface",
-        ":ComplexDialect",
-        ":ControlFlowInterfaces",
-        ":CopyOpInterface",
         ":DestinationStyleOpInterface",
         ":DialectUtils",
         ":IR",
         ":InferTypeOpInterface",
-        ":LinalgEnumsIncGen",
         ":LinalgInterfacesIncGen",
-        ":LinalgOpsIncGen",
-        ":LinalgRelayoutOpsIncGen",
         ":LinalgStructuredOpsIncGen",
-        ":SideEffectInterfaces",
         ":Support",
-        ":TilingInterface",
         ":ViewLikeInterface",
-        "//llvm:Support",
     ],
 )
 
@@ -11582,6 +11568,7 @@ cc_library(
     name = "LinalgDialect",
     srcs = [
         "lib/Dialect/Linalg/IR/LinalgDialect.cpp",
+        "lib/Dialect/Linalg/IR/LinalgInterfaces.cpp",
         "lib/Dialect/Linalg/IR/LinalgOps.cpp",
         "lib/Dialect/Linalg/IR/ValueBoundsOpInterfaceImpl.cpp",
     ],
@@ -11608,6 +11595,7 @@ cc_library(
         ":InliningUtils",
         ":LinalgEnumsIncGen",
         ":LinalgInterfaces",
+        ":LinalgInterfacesIncGen",
         ":LinalgNamedStructuredOpsYamlIncGen",
         ":LinalgOpsIncGen",
         ":LinalgRelayoutOpsIncGen",

utils/bazel/llvm-project-overlay/mlir/unittests/BUILD.bazel

@@ -176,7 +176,6 @@ cc_test(
         "//mlir:ArithDialect",
         "//mlir:FuncDialect",
         "//mlir:IR",
-        "//mlir:LinalgDialect",
         "//mlir:Parser",
         "//mlir:SCFDialect",
         "//mlir:SideEffectInterfaces",
@@ -212,7 +211,6 @@ cc_test(
         "//llvm:Support",
         "//llvm:TestingSupport",
         "//mlir:IR",
-        "//mlir:LinalgDialect",
         "//mlir:SPIRVBinaryUtils",
         "//mlir:SPIRVDeserialization",
         "//mlir:SPIRVDialect",