[DebugInfo] Inline for without DebugLocation

Summary:
This test is a strip down version of a function inside the
amalgamated sqlite source. When converted to IR clang produces
a phi instruction without debug location.

This patch fixes the above issue.

Differential Revision: https://reviews.llvm.org/D47720

llvm-svn: 335255

clang/lib/CodeGen/CGExprScalar.cpp

@@ -3431,6 +3431,12 @@ Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
   // Insert an entry into the phi node for the edge with the value of RHSCond.
   PN->addIncoming(RHSCond, RHSBlock);
 
+  // Artificial location to preserve the scope information
+  {
+    auto NL = ApplyDebugLocation::CreateArtificial(CGF);
+    PN->setDebugLoc(Builder.getCurrentDebugLocation());
+  }
+
   // ZExt result to int.
   return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
 }

clang/test/CodeGen/debug-info-inline-for.c

@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -debug-info-kind=limited -emit-llvm -o - %s | FileCheck %s
+// Check that clang emits Debug location in the phi instruction
+
+int func(int n) {
+  int a;
+  for(a = 10; a>0 && n++; a--);
+  return n;
+}
+
+// CHECK: land.end:
+// CHECK-NEXT: {{.*}} = phi i1 {{.*}} !dbg ![[DbgLoc:[0-9]+]]
+
+// CHECK: ![[DbgLoc]] = !DILocation(line: 0