Xcode 4.3.3 Release was released on 7 Jun 2012 and requires macOS 10.7+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/xcode_4.3.3_for_lion/xcode_4.3.3_for_lion.dmg.
The compilers it contains are:
- clang 3.1 (Build 318.0.61)
- LLVM-GCC (Build 2336.9.00)