Update README and update_test_shaders.sh.

README.md

@@ -279,6 +279,7 @@ although there are a couple of convenience script for doing this:
 
 ```
 ./checkout_glslang_spirv_tools.sh # Checks out glslang and SPIRV-Tools at a fixed revision which matches the reference output.
+./build_glslang_spirv_tools.sh    # Builds glslang and SPIRV-Tools.
 ./test_shaders.sh                 # Runs over all changes and makes sure that there are no deltas compared to reference files.
 ```
 

update_test_shaders.sh

@@ -9,9 +9,12 @@ echo "Using spirv-opt in: $(which spirv-opt)."
 
 ./test_shaders.py shaders --update || exit 1
 ./test_shaders.py shaders --update --opt || exit 1
-./test_shaders.py shaders-msl --msl --update || exit 1
-./test_shaders.py shaders-msl --msl --update --opt || exit 1
-./test_shaders.py shaders-msl-no-opt --msl --update || exit 1
-./test_shaders.py shaders-hlsl --hlsl --update || exit 1
-./test_shaders.py shaders-hlsl --hlsl --update --opt || exit 1
+./test_shaders.py shaders-no-opt --update || exit 1
+./test_shaders.py shaders-msl --update --msl || exit 1
+./test_shaders.py shaders-msl --update --msl --opt || exit 1
+./test_shaders.py shaders-msl-no-opt --update --msl || exit 1
+./test_shaders.py shaders-hlsl --update --hlsl || exit 1
+./test_shaders.py shaders-hlsl --update --hlsl --opt || exit 1
+./test_shaders.py shaders-hlsl-no-opt --update --hlsl || exit 1
+