[sil-opt] Add an option irgen-debuginfo-level to set the IRGen debug info level for IRGen passes.

This allows for IRGen passes to make decisions based off of the IRGen debug info
level like they can when used by a swift-frontend invocation.

Author: gottesmm

tools/sil-opt/SILOpt.cpp

@@ -296,6 +296,18 @@ static llvm::cl::opt<OptimizationMode> OptModeFlag(
                                 "ignore debug info, reduce runtime")),
     llvm::cl::init(OptimizationMode::NotSet));
 
+static llvm::cl::opt<IRGenDebugInfoLevel> IRGenDebugInfoLevelArg(
+    "irgen-debuginfo-level", llvm::cl::desc("IRGen debug info level"),
+    llvm::cl::values(clEnumValN(IRGenDebugInfoLevel::None, "none",
+                                "No debug info"),
+                     clEnumValN(IRGenDebugInfoLevel::LineTables, "line-tables",
+                                "Line tables only"),
+                     clEnumValN(IRGenDebugInfoLevel::ASTTypes, "ast-types",
+                                "Line tables + AST type references"),
+                     clEnumValN(IRGenDebugInfoLevel::DwarfTypes, "dwarf-types",
+                                "Line tables + AST type refs + Dwarf types")),
+    llvm::cl::init(IRGenDebugInfoLevel::ASTTypes));
+
 static llvm::cl::opt<OptGroup> OptimizationGroup(
     llvm::cl::desc("Predefined optimization groups:"),
     llvm::cl::values(
@@ -684,6 +696,7 @@ int main(int argc, char **argv) {
   } else {
     IRGenOpts.OptMode = OptModeFlag;
   }
+  IRGenOpts.DebugInfoLevel = IRGenDebugInfoLevelArg;
 
   // Note: SILOpts, LangOpts, and IRGenOpts must be set before the
   // CompilerInstance is initializer below based on Invocation.