[PATCH] Schedule discriminators pass.

[Diego Novillo]

  Factored some bits from this patch into http://llvm-reviews.chandlerc.com/D2891.

Hi echristo,

http://llvm-reviews.chandlerc.com/D2692

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2692?vs=7183&id=7383#toc

Files:
  lib/CodeGen/BackendUtil.cpp
  test/CodeGenCXX/linetable-eh.cpp

Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -165,6 +165,11 @@
   PM.add(createSampleProfileLoaderPass(CGOpts.SampleProfileFile));
 }
 
+static void addAddDiscriminatorsPass(const PassManagerBuilder &Builder,
+                                     PassManagerBase &PM) {
+  PM.add(createAddDiscriminatorsPass());
+}
+
 static void addBoundsCheckingPass(const PassManagerBuilder &Builder,
                                     PassManagerBase &PM) {
   PM.add(createBoundsCheckingPass());
@@ -245,6 +250,9 @@
   PMBuilder.DisableUnrollLoops = !CodeGenOpts.UnrollLoops;
   PMBuilder.RerollLoops = CodeGenOpts.RerollLoops;
 
+  PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
+                         addAddDiscriminatorsPass);
+
   if (!CodeGenOpts.SampleProfileFile.empty())
     PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
                            addSampleProfileLoaderPass);
Index: test/CodeGenCXX/linetable-eh.cpp
===================================================================
--- test/CodeGenCXX/linetable-eh.cpp
+++ test/CodeGenCXX/linetable-eh.cpp
@@ -6,15 +6,16 @@
 // CHECK: call void @llvm.dbg.declare
 // CHECK: call void @llvm.dbg.declare(metadata !{{{.*}}}, metadata ![[CURRENT_ADDR:.*]]), !dbg ![[DBG1:.*]]
 // CHECK: unwind label %{{.*}}, !dbg ![[DBG1]]
-// CHECK: store i64 %{{.*}}, i64* %current_address, align 8, !dbg ![[DBG1]]
+// CHECK: store i64 %{{.*}}, i64* %current_address, align 8, !dbg ![[DBG4:.*]]
 // CHECK-NEXT: call void @llvm.dbg.declare(metadata !{{{.*}}}, metadata ![[FOUND_IT:.*]]), !dbg ![[DBG2:.*]]
 // CHECK: = landingpad
 // CHECK-NEXT: cleanup, !dbg ![[DBG3:.*]]
 // CHECK-DAG: ![[CURRENT_ADDR]] = {{.*}} [current_address]
 // CHECK-DAG: ![[FOUND_IT]] = {{.*}} [found_it]
 // CHECK-DAG: ![[DBG1]] = metadata !{i32 256,
 // CHECK-DAG: ![[DBG2]] = metadata !{i32 257,
 // CHECK-DAG: ![[DBG3]] = metadata !{i32 268,
+// CHECK-DAG: ![[DBG4]] = metadata !{i32 256,
 typedef unsigned long long uint64_t;
 template<class _Tp> class shared_ptr {
 public:
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