[OpenCL-aot] Return a Friendlier Error When Build Kernel Failed (#12124)

There is no useful information output, when compilation fails, unless
"verbose" (-v) is set to true. This PR is to output the build log when
compiling the kernel fails, and has no effect on the functionality of
the original "-v" option.

---------

Co-authored-by: Alexey Sachkov <[email protected]>

Author: ChengChen002

opencl/opencl-aot/source/main.cpp

@@ -593,7 +593,7 @@ int main(int Argc, char *Argv[]) {
     break;
   }
 
-  std::string CompilerBuildLog;
+  std::string CompilerBuildLog, CompilerBuildLogMessage;
   std::tie(CompilerBuildLog, ErrorMessage, std::ignore) =
       getCompilerBuildLog(ProgramUPtr, DeviceId);
 
@@ -604,18 +604,20 @@ int main(int Argc, char *Argv[]) {
   }
 
   if (!CompilerBuildLog.empty()) {
-    std::string CompilerBuildLogMessage = "\n" +
-                                          CmdToCmdInfoMap[OptCommand].first +
-                                          " log:\n" + CompilerBuildLog + '\n';
-    if (!ErrorMessage.empty())
-      std::cerr << CompilerBuildLogMessage;
-    else
-      logs() << CompilerBuildLogMessage;
+    // According to the return value of getCompilerBuildLog(), ErrorMessage is
+    // always empty if CompilerBuildLog is not empty.
+    CompilerBuildLogMessage = "\n" + CmdToCmdInfoMap[OptCommand].first +
+                              " log:\n" + CompilerBuildLog + '\n';
+    logs() << CompilerBuildLogMessage;
   }
 
   if (clFailed(CLErr)) {
     std::string ErrMsg =
         "Failed to " + CmdToCmdInfoMap[OptCommand].first + ": ";
+    // will print CompilerBuildLogMessage when build failed in case verbose is
+    // false, in order to provide a friendlier compile error for users.
+    if (!verbose)
+      std::cerr << CompilerBuildLogMessage;
     std::cerr << formatCLError(ErrMsg, CLErr) << '\n';
     return CLErr;
   }