swift

56052215 - Disable ASTGen runtime-compat libs

Disable ASTGen runtime-compat libs The runtime compat libraries are not available during the stage-0 compiler ASTGen build. As a result, the compiler fails to link because the compat symbols are not available. Once we have better stage tracking, we should turn this on for stages after the compat56 library has been built. Turning it off for now is safe enough because the ASTGen library doesn't use concurrency, and thus far, that is the only area with backdeployed fixes.