BaseTools/Plugin: Report error if code coverage failure

If code coverage exist failure, CI/CD need to catch it

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Signed-off-by: Gua Guo <gua.guo@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Michael Kubacki <mikuback@linux.microsoft.com>

BaseTools/Plugin/HostBasedUnitTestRunner/HostBasedUnitTestRunner.py

@@ -130,9 +130,13 @@ def do_post_build(self, thebuilder):
 
             if thebuilder.env.GetValue("CODE_COVERAGE") != "FALSE":
                 if thebuilder.env.GetValue("TOOL_CHAIN_TAG") == "GCC5":
-                    self.gen_code_coverage_gcc(thebuilder)
+                    ret = self.gen_code_coverage_gcc(thebuilder)
+                    if ret != 0:
+                        failure_count += 1
                 elif thebuilder.env.GetValue("TOOL_CHAIN_TAG").startswith ("VS"):
-                    self.gen_code_coverage_msvc(thebuilder)
+                    ret = self.gen_code_coverage_msvc(thebuilder)
+                    if ret != 0:
+                        failure_count += 1
                 else:
                     logging.info("Skipping code coverage. Currently, support GCC and MSVC compiler.")