[analyzer] SATest: Add a set of initial projects for testing

Differential Revision: https://reviews.llvm.org/D81592
diff --git a/.gitignore b/.gitignore
index eff6268..43ff479 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,8 @@
 .vs
 # clangd index
 .clangd
+# static analyzer regression testing project files
+/clang/utils/analyzer/projects/*/CachedSource
+/clang/utils/analyzer/projects/*/PatchedSource
+/clang/utils/analyzer/projects/*/ScanBuildResults
+/clang/utils/analyzer/projects/*/RefScanBuildResults
\ No newline at end of file