[Bazel] Add llvm-mca unittests (#90309)

This patch refactors the llvm-mca rules slightly so that the source
files within the tool source directory but not the library source
directory are included in a separate cc_library. This patch also adds
the llvm-mca unittests.

Author: boomanaiden154

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

@@ -3111,12 +3111,26 @@ cc_library(
 )
 
 cc_library(
-    name = "llvm-mca-headers",
+    name = "MCAApplication",
+    srcs = glob([
+        "tools/llvm-mca/Views/*.cpp",
+    ]) + [
+        mca_source
+        for mca_source in glob(["tools/llvm-mca/*.cpp"])
+        if mca_source != "tools/llvm-mca/llvm-mca.cpp"
+    ],
     hdrs = glob([
         "tools/llvm-mca/*.h",
         "tools/llvm-mca/Views/*.h",
     ]),
     strip_include_prefix = "tools/llvm-mca",
+    deps = [
+        ":MC",
+        ":MCA",
+        ":MCParser",
+        ":Support",
+        ":TargetParser",
+    ],
 )
 
 cc_library(
@@ -4034,12 +4048,9 @@ cc_binary(
 
 cc_binary(
     name = "llvm-mca",
-    srcs = glob([
-        "tools/llvm-mca/*.cpp",
-        "tools/llvm-mca/*.h",
-        "tools/llvm-mca/Views/*.cpp",
-        "tools/llvm-mca/Views/*.h",
-    ]),
+    srcs =[
+        "tools/llvm-mca/llvm-mca.cpp",
+    ],
     copts = llvm_copts,
     stamp = 0,
     deps = [
@@ -4049,10 +4060,10 @@ cc_binary(
         ":AllTargetsMCAs",
         ":MC",
         ":MCA",
+        ":MCAApplication",
         ":MCParser",
         ":Support",
         ":TargetParser",
-        ":llvm-mca-headers",
     ],
 )
 

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

@@ -811,3 +811,29 @@ cc_test(
         "//third-party/unittest:gtest_main",
     ],
 )
+
+cc_test(
+    name = "llvm_mca_tests",
+    size = "small",
+    srcs = glob(
+        [
+            "tools/llvm-mca/*.cpp",
+            "tools/llvm-mca/*.h",
+            "tools/llvm-mca/X86/*.cpp",
+            "tools/llvm-mca/X86/*.h",
+        ],
+        allow_empty = False,
+    ),
+    includes = ["tools/llvm-mca"],
+    deps = [
+        "//llvm:MC",
+        "//llvm:MCA",
+        "//llvm:MCAApplication",
+        "//llvm:Support",
+        "//llvm:TargetParser",
+        "//llvm:X86CodeGen",
+        "//llvm:X86UtilsAndDesc",
+        "//third-party/unittest:gtest",
+        "//third-party/unittest:gtest_main",
+    ],
+)