ch3: added LLVM IR code genchapter3

- Added safe wrapper around LLVM C API
- Added codegen module to emit LLVM IR for the AST
- Update the main repl loop to codegen LLVM IR

1 files changed, 100 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index dd2a11a..ece31e8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,105 @@
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