[clang] [llvm] [Clang][Unittest] Support for `target` directive and `from` clause in clang unittests (PR #150580)

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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp,c -- offload/test/offloading/strided_update.c clang/include/clang/ASTMatchers/ASTMatchers.h clang/lib/ASTMatchers/ASTMatchersInternal.cpp clang/lib/ASTMatchers/Dynamic/Registry.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/offload/test/offloading/strided_update.c b/offload/test/offloading/strided_update.c
index 271a00de5..c223e159c 100644
--- a/offload/test/offloading/strided_update.c
+++ b/offload/test/offloading/strided_update.c
@@ -1,33 +1,34 @@
-// Checks that "update from" clause in OpenMP is supported when the elements are updated in a non-contiguous manner.
-// RUN: %libomptarget-compile-run-and-check-generic
-#include <omp.h>  
-#include <stdio.h>  
-  
-int main() {  
-  int len = 8;  
-  double data[len];  
-  #pragma omp target map(tofrom: len, data[0:len])  
-  {  
-    for (int i = 0; i < len; i++) {  
-      data[i] = i;  
-    }  
-  }  
-  // initial values  
-  printf("original host array values:\n");  
-  for (int i = 0; i < len; i++)  
-    printf("%f\n", data[i]);  
-  printf("\n");  
-  
-  #pragma omp target data map(to: len, data[0:len])  
-  {  
-    #pragma omp target  
-    for (int i = 0; i < len; i++) {  
-      data[i] += i ;  
-    }  
-  
-    #pragma omp target update from(data[0:8:2])  
-  }  
-  // from results  
+// Checks that "update from" clause in OpenMP is supported when the elements are
+// updated in a non-contiguous manner. RUN:
+// %libomptarget-compile-run-and-check-generic
+#include <omp.h>
+#include <stdio.h>
+
+int main() {
+  int len = 8;
+  double data[len];
+#pragma omp target map(tofrom : len, data[0 : len])
+  {
+    for (int i = 0; i < len; i++) {
+      data[i] = i;
+    }
+  }
+  // initial values
+  printf("original host array values:\n");
+  for (int i = 0; i < len; i++)
+    printf("%f\n", data[i]);
+  printf("\n");
+
+#pragma omp target data map(to : len, data[0 : len])
+  {
+#pragma omp target
+    for (int i = 0; i < len; i++) {
+      data[i] += i;
+    }
+
+#pragma omp target update from(data[0 : 8 : 2])
+  }
+  // from results
   // CHECK: 0.000000
   // CHECK: 1.000000
   // CHECK: 4.000000
@@ -41,10 +42,10 @@ int main() {
   // CHECK-NOT: 10.000000
   // CHECK-NOT: 14.000000
 
-  printf("from target array results:\n");  
-  for (int i = 0; i < len; i++)  
-    printf("%f\n", data[i]);  
-  printf("\n");  
-  
-  return 0;  
-}  
+  printf("from target array results:\n");
+  for (int i = 0; i < len; i++)
+    printf("%f\n", data[i]);
+  printf("\n");
+
+  return 0;
+}

``````````

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https://github.com/llvm/llvm-project/pull/150580