[sanitizer] Introduce VReport and VPrintf macros and use them in sanitizer code.

Instead of "if (common_flags()->verbosity) Report(...)" we now have macros.

llvm-svn: 196497
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_coverage.cc b/compiler-rt/lib/sanitizer_common/sanitizer_coverage.cc
index 9e7a0f8..0e928e0 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_coverage.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_coverage.cc
@@ -96,8 +96,7 @@
       uptr fd = OpenFile(path.data(), true);
       internal_write(fd, offsets.data(), offsets.size() * sizeof(u32));
       internal_close(fd);
-      if (common_flags()->verbosity)
-        Report(" CovDump: %s: %zd PCs written\n", path.data(), vb - old_vb);
+      VReport(1, " CovDump: %s: %zd PCs written\n", path.data(), vb - old_vb);
     }
   }
 #endif  // !SANITIZER_WINDOWS