Fix setting LLVM data layout before optimizations passes

The data layout was only being set right before lowering to machine
code. The optimization passes need accurate data layout info as well.

Bug: b/135691587
Change-Id: Ic1524d57bb6d8d0eb725e33d27e100a6286f1571
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33309
Tested-by: Nicolas Capens <nicolascapens@google.com>
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

Author: c0d1f1ed

src/Reactor/LLVMReactor.cpp

@@ -678,6 +678,7 @@ namespace rr
 		void startSession()
 		{
 			::module = new llvm::Module("", *::context);
+			::module->setDataLayout(dataLayout);
 		}
 
 		void endSession()
@@ -705,7 +706,6 @@ namespace rr
 			// been freed.
 			std::unique_ptr<llvm::Module> mod(::module);
 			::module = nullptr;
-			mod->setDataLayout(dataLayout);
 
 			auto moduleKey = session.allocateVModule();