[CodeGen] Don't include CGDebugInfo.h in CodeGenFunction.h (NFC)

This is an expensive header, only include it where needed. Move
some functions out of line to achieve that.

This reduces time to build clang by ~0.5% in terms of instructions
retired.

Author: nikic

clang/lib/CodeGen/CGBuiltin.cpp

@@ -14,6 +14,7 @@
 #include "ABIInfo.h"
 #include "CGCUDARuntime.h"
 #include "CGCXXABI.h"
+#include "CGDebugInfo.h"
 #include "CGObjCRuntime.h"
 #include "CGOpenCLRuntime.h"
 #include "CGRecordLayout.h"

clang/lib/CodeGen/CGCall.cpp

@@ -17,6 +17,7 @@
 #include "CGBlocks.h"
 #include "CGCXXABI.h"
 #include "CGCleanup.h"
+#include "CGDebugInfo.h"
 #include "CGRecordLayout.h"
 #include "CodeGenFunction.h"
 #include "CodeGenModule.h"

clang/lib/CodeGen/CGCoroutine.cpp

@@ -11,10 +11,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "CGCleanup.h"
+#include "CGDebugInfo.h"
 #include "CodeGenFunction.h"
-#include "llvm/ADT/ScopeExit.h"
 #include "clang/AST/StmtCXX.h"
 #include "clang/AST/StmtVisitor.h"
+#include "llvm/ADT/ScopeExit.h"
 
 using namespace clang;
 using namespace CodeGen;

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -6223,3 +6223,23 @@ CGDebugInfo::createConstantValueExpression(const clang::ValueDecl *VD,
 
   return nullptr;
 }
+
+CodeGenFunction::LexicalScope::LexicalScope(CodeGenFunction &CGF,
+                                            SourceRange Range)
+    : RunCleanupsScope(CGF), Range(Range), ParentScope(CGF.CurLexicalScope) {
+  CGF.CurLexicalScope = this;
+  if (CGDebugInfo *DI = CGF.getDebugInfo())
+    DI->EmitLexicalBlockStart(CGF.Builder, Range.getBegin());
+}
+
+CodeGenFunction::LexicalScope::~LexicalScope() {
+  if (CGDebugInfo *DI = CGF.getDebugInfo())
+    DI->EmitLexicalBlockEnd(CGF.Builder, Range.getEnd());
+
+  // If we should perform a cleanup, force them now.  Note that
+  // this ends the cleanup scope before rescoping any labels.
+  if (PerformCleanup) {
+    ApplyDebugLocation DL(CGF, Range.getEnd());
+    ForceCleanup();
+  }
+}

clang/lib/CodeGen/CGDeclCXX.cpp

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "CGCXXABI.h"
+#include "CGDebugInfo.h"
 #include "CGHLSLRuntime.h"
 #include "CGObjCRuntime.h"
 #include "CGOpenMPRuntime.h"

clang/lib/CodeGen/CGException.cpp

@@ -12,6 +12,7 @@
 
 #include "CGCXXABI.h"
 #include "CGCleanup.h"
+#include "CGDebugInfo.h"
 #include "CGObjCRuntime.h"
 #include "CodeGenFunction.h"
 #include "ConstantEmitter.h"

clang/lib/CodeGen/CGExprAgg.cpp

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "CGCXXABI.h"
+#include "CGDebugInfo.h"
 #include "CGHLSLRuntime.h"
 #include "CGObjCRuntime.h"
 #include "CGRecordLayout.h"

clang/lib/CodeGen/CGExprComplex.cpp

@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "CGDebugInfo.h"
 #include "CGOpenMPRuntime.h"
 #include "CodeGenFunction.h"
 #include "CodeGenModule.h"

clang/lib/CodeGen/CGNonTrivialStruct.cpp

@@ -11,6 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "CGDebugInfo.h"
 #include "CodeGenFunction.h"
 #include "CodeGenModule.h"
 #include "clang/AST/NonTrivialTypeVisitor.h"

clang/lib/CodeGen/CGOpenMPRuntime.cpp

@@ -14,6 +14,7 @@
 #include "ABIInfoImpl.h"
 #include "CGCXXABI.h"
 #include "CGCleanup.h"
+#include "CGDebugInfo.h"
 #include "CGRecordLayout.h"
 #include "CodeGenFunction.h"
 #include "TargetInfo.h"