Add the majority of the remaining optimizer passes

Commented passes require parameters that we cannot provide if we're
going to keep the existing lookup mechanism.  We need to be clever about
argument saturation for parametrized optimizations.

Author: CodaFi

Sources/LLVM/PassManager.swift

@@ -124,6 +124,46 @@ public enum FunctionPass {
   case basicAliasAnalysis
   /// Runs the LLVM IR Verifier to sanity check the results of passes.
   case verifier
+  /// A pass to inline and remove functions marked as "always_inline".
+  case alwaysInliner
+  /// This pass promotes "by reference" arguments to be passed by value if the 
+  /// number of elements passed is less than or equal to 3.
+  case argumentPromotion
+  /// This function returns a new pass that merges duplicate global constants 
+  /// together into a single constant that is shared. This is useful because 
+  /// some passes (ie TraceValues) insert a lot of string constants into the 
+  /// program, regardless of whether or not they duplicate an existing string.
+  case constantMerge
+  /// This pass removes arguments from functions which are not used by the body
+  /// of the function.
+  case deadArgElimination
+  /// This pass walks SCCs of the call graph in RPO to deduce and propagate 
+  /// function attributes. Currently it only handles synthesizing `norecurse`
+  /// attributes.
+  case functionAttrs
+  /// Uses a heuristic to inline direct function calls to small functions.
+  case functionInlining
+  /// This transform is designed to eliminate unreachable internal globals 
+  /// (functions or global variables)
+  case globalDCE
+  /// This function returns a new pass that optimizes non-address taken internal
+  /// globals.
+  case globalOptimizer
+  /// This pass propagates constants from call sites into the bodies of 
+  /// functions.
+  case ipConstantPropagation
+  /// This pass propagates constants from call sites into the bodies of 
+  /// functions, and keeps track of whether basic blocks are executable in the 
+  /// process.
+  case ipscc
+  /// Return a new pass object which transforms invoke instructions into calls, 
+  /// if the callee can *not* unwind the stack.
+  case pruneEH
+  /// This pass removes any function declarations (prototypes) that are not used.
+  case stripDeadPrototypes
+  /// These functions removes symbols from functions and modules without 
+  /// touching symbols for debugging information.
+  case stripSymbols
 }
 
 /// A `FunctionPassManager` is an object that collects a sequence of passes
@@ -170,6 +210,22 @@ public class FunctionPassManager {
     .typeBasedAliasAnalysis: LLVMAddTypeBasedAliasAnalysisPass,
     .scopedNoAliasAA: LLVMAddScopedNoAliasAAPass,
     .basicAliasAnalysis: LLVMAddBasicAliasAnalysisPass,
+    .alwaysInliner: LLVMAddAlwaysInlinerPass,
+    .argumentPromotion: LLVMAddArgumentPromotionPass,
+    .constantMerge: LLVMAddConstantMergePass,
+    .deadArgElimination: LLVMAddDeadArgEliminationPass,
+    .functionAttrs: LLVMAddFunctionAttrsPass,
+    .functionInlining: LLVMAddFunctionInliningPass,
+    .globalDCE: LLVMAddGlobalDCEPass,
+    .globalOptimizer: LLVMAddGlobalOptimizerPass,
+    .ipConstantPropagation: LLVMAddIPConstantPropagationPass,
+    .ipscc: LLVMAddIPSCCPPass,
+    .pruneEH: LLVMAddPruneEHPass,
+    .stripDeadPrototypes: LLVMAddStripDeadPrototypesPass,
+    .stripSymbols: LLVMAddStripSymbolsPass,
+
+//    .internalize: LLVMAddInternalizePass,
+//    .sroaWithThreshhold: LLVMAddScalarReplAggregatesPassWithThreshold,
   ]
 
   /// Creates a `FunctionPassManager` bound to the given module's IR.