Revise C++ coding style using clang-format-6.0

Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`.  Use `clang-format` version 6.0.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Tests/COnly/libc2.h

@@ -1,11 +1,11 @@
 #ifdef _WIN32
-#ifdef testc2_EXPORTS
-#define CM_TEST_LIB_EXPORT __declspec(dllexport)
+#  ifdef testc2_EXPORTS
+#    define CM_TEST_LIB_EXPORT __declspec(dllexport)
+#  else
+#    define CM_TEST_LIB_EXPORT __declspec(dllimport)
+#  endif
 #else
-#define CM_TEST_LIB_EXPORT __declspec(dllimport)
-#endif
-#else
-#define CM_TEST_LIB_EXPORT
+#  define CM_TEST_LIB_EXPORT
 #endif
 
 CM_TEST_LIB_EXPORT float LibC2Func();

Tests/COnly/testCModule.c

@@ -1,7 +1,7 @@
 #ifdef _WIN32
-#define TEST_EXPORT __declspec(dllexport)
+#  define TEST_EXPORT __declspec(dllexport)
 #else
-#define TEST_EXPORT
+#  define TEST_EXPORT
 #endif
 TEST_EXPORT int testCModule(void)
 {