[flang][examples] Add missing CMake dependencies

Currently, everything that includes "flang/Parser/parse-tree.h" in Flang
depends on the `gen_acc` and `gen_omp` CMake targets (these targets
generate include files that are used in "parse-tree.h"). The examples in
Flang do use this header file and hence also depend on
`gen_acc`/`gen_omp`. This patch updates relevant CMake scripts
accordingly.

I've also taken the liberty to rename some of the example files so that
their names follow LLVM's coding guidelines.

Differential Revision: https://reviews.llvm.org/D117016

flang/examples/CMakeLists.txt

@@ -12,4 +12,4 @@ target_link_libraries(external-hello-world
 )
 
 add_subdirectory(PrintFlangFunctionNames)
-add_subdirectory(flang-omp-report-plugin)
+add_subdirectory(FlangOmpReport)

flang/examples/FlangOmpReport/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_llvm_library(flangOmpReport
+  MODULE
+  FlangOmpReport.cpp
+  FlangOmpReportVisitor.cpp
+
+  DEPENDS
+  acc_gen
+  omp_gen
+)

flang/examples/FlangOmpReport/FlangOmpReport.cpp

@@ -15,7 +15,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "flang-omp-report-visitor.h"
+#include "FlangOmpReportVisitor.h"
 
 #include "flang/Frontend/CompilerInstance.h"
 #include "flang/Frontend/FrontendActions.h"

flang/examples/FlangOmpReport/FlangOmpReportVisitor.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "flang-omp-report-visitor.h"
+#include "FlangOmpReportVisitor.h"
 #include "llvm/ADT/StringExtras.h"
 
 namespace Fortran {

flang/examples/PrintFlangFunctionNames/CMakeLists.txt

@@ -1,7 +1,10 @@
 # TODO: Note that this is currently only available on Linux.
 # On Windows, we would also have to specify e.g. `PLUGIN_TOOL`.
-add_llvm_library(
-    flangPrintFunctionNames
+add_llvm_library(flangPrintFunctionNames
     MODULE
     PrintFlangFunctionNames.cpp
+
+    DEPENDS
+    acc_gen
+    omp_gen
 )

flang/examples/flang-omp-report-plugin/CMakeLists.txt

@@ -1,6 +0,0 @@
-add_llvm_library(
-  flangOmpReport
-  MODULE
-  flang-omp-report.cpp
-  flang-omp-report-visitor.cpp
-)