create llvm:all_targets build target, and fix the dependency to it in MLIR.

PiperOrigin-RevId: 294993824
Change-Id: I294e51cf15e773abeaf6ec7c3dcc8b4864025583

third_party/llvm/llvm.autogenerated.BUILD

@@ -645,6 +645,18 @@ cc_binary(
     ],
 )
 
+cc_library(
+    name = "all_targets",
+    deps = [
+        ":aarch64_code_gen",
+        ":amdgpu_code_gen",
+        ":arm_code_gen",
+        ":nvptx_code_gen",
+        ":powerpc_code_gen",
+        ":x86_code_gen",
+    ],
+)
+
 cc_library(
     name = "aarch64_asm_parser",
     srcs = glob([

third_party/mlir/BUILD

@@ -681,7 +681,7 @@ cc_library(
         ":Pass",
         ":Support",
         ":TargetNVVMIR",
-        "//third_party/llvm/llvm-project/llvm:all_targets",
+        "@llvm-project//llvm:all_targets",
         "@llvm-project//llvm:core",
         "@llvm-project//llvm:support",
         "@llvm-project//llvm:target",
@@ -1778,7 +1778,7 @@ cc_binary(
         ":OpenMPDialect",
         ":QuantOps",
         ":Transforms",
-        "//third_party/llvm/llvm-project/llvm:all_targets",
+        "@llvm-project//llvm:all_targets",
         "@llvm-project//llvm:support",
         "@llvm-project//mlir/test:TestDialect",
         "@llvm-project//mlir/test:TestIR",