restore deleted test

Author: OCHyams

clang/test/DebugInfo/KeyInstructions/multi-func.c

@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -gkey-instructions -gno-column-info -x c++ %s -debug-info-kind=line-tables-only -emit-llvm -o - \
+// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
+
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -gkey-instructions -gno-column-info -x c %s -debug-info-kind=line-tables-only -emit-llvm -o - \
+// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
+
+// Check atomGroup is reset to start at 1 in each function.
+
+int g;
+// CHECK: store{{.*}}, !dbg [[AG:!.*]]
+void a() { g = 0; }
+
+// CHECK: store{{.*}}, !dbg [[BG:!.*]]
+void b() { g = 0; }
+
+// CHECK: [[A:!.*]] = distinct !DISubprogram(name: "a",
+// CHECK: [[AG]] = !DILocation(line: 11, scope: [[A]], atomGroup: 1, atomRank: 1)
+// CHECK: [[B:!.*]] = distinct !DISubprogram(name: "b",
+// CHECK: [[BG]] = !DILocation(line: 14, scope: [[B]], atomGroup: 1, atomRank: 1)