Cleanup includes. (#1795)
This Cl cleans up the include paths to be relative to the top level
directory. Various include-what-you-use fixes have been added.
diff --git a/source/enum_string_mapping.cpp b/source/enum_string_mapping.cpp
index 20bbdfc..32361a0 100644
--- a/source/enum_string_mapping.cpp
+++ b/source/enum_string_mapping.cpp
@@ -12,7 +12,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.
-#include "enum_string_mapping.h"
+#include "source/enum_string_mapping.h"
#include <algorithm>
#include <cassert>
@@ -20,7 +20,7 @@
#include <string>
#include <unordered_map>
-#include "extensions.h"
+#include "source/extensions.h"
namespace spvtools {