Reactor: Add new 'EarlyCSEPass' optimization pass.

src/Main/SwiftConfig.cpp

@@ -414,6 +414,7 @@ namespace sw
 			html += "<option value='7'"   + (config.optimization[pass] == rr::Optimization::Pass::DeadStoreElimination ? selected : empty) + ">Dead Store Elimination</option>\n";
 			html += "<option value='8'"   + (config.optimization[pass] == rr::Optimization::Pass::SCCP ? selected : empty) + ">Sparse Conditional Copy Propagation</option>\n";
 			html += "<option value='9'"   + (config.optimization[pass] == rr::Optimization::Pass::ScalarReplAggregates ? selected : empty) + ">Scalar Replacement of Aggregates</option>\n";
+			html += "<option value='10'"  + (config.optimization[pass] == rr::Optimization::Pass::EarlyCSEPass ? selected : empty) + ">Eliminate trivially redundant instructions</option>\n";
 			html += "</select></td></tr>\n";
 		}
 

src/Reactor/LLVMReactor.cpp

@@ -392,6 +392,7 @@ namespace
 				case rr::Optimization::Pass::DeadStoreElimination: passManager->add(llvm::createDeadStoreEliminationPass()); break;
 				case rr::Optimization::Pass::SCCP:                 passManager->add(llvm::createSCCPPass());                 break;
 				case rr::Optimization::Pass::ScalarReplAggregates: passManager->add(llvm::createSROAPass());                 break;
+				case rr::Optimization::Pass::EarlyCSEPass:         passManager->add(llvm::createEarlyCSEPass());             break;
 				default:
 					UNREACHABLE("pass: %d", int(pass));
 				}

src/Reactor/Nucleus.hpp

@@ -57,6 +57,7 @@ namespace rr
 			DeadStoreElimination,
 			SCCP,
 			ScalarReplAggregates,
+			EarlyCSEPass,
 
 			Count,
 		};