CMake rebuild script

When iterating locally, it's useful to rebuild and rely on CMake's caching rather than doing a full clean build. CMake's caching is a bit sketchy sometimes, so it's also useful to do a full clean build. Split things out so we have a script for each.

Depends on https://github.com/google/iree/pull/1001

Closes https://github.com/google/iree/pull/1003

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/1003 from GMNGeoffrey:rebuild-cmake 95a4fc681de8cbe5289a5a0c0a449ae0ae873a58
PiperOrigin-RevId: 299882490
diff --git a/build_tools/cmake/test.sh b/build_tools/cmake/test.sh
index ff39c59..99c8bcc 100755
--- a/build_tools/cmake/test.sh
+++ b/build_tools/cmake/test.sh
@@ -14,7 +14,7 @@
 
 # Run all(ish) IREE tests with CTest. Designed for CI, but can be run manually.
 # Assumes that the project has already been built at ${REPO_ROOT}/build (e.g.
-# with build_tools/cmake/build.sh)
+# with build_tools/cmake/clean_build.sh)
 
 set -x
 set -e