coverage testing with garbarge collection on

[davidxl]

Summary

The patch depends on the fix in http://reviews.llvm.org/D16092

test/profile/Linux/coverage_test.cpp

+// RUN: %clang_profgen -fuse-ld=gold -O2 -fdata-sections -ffunction-sections -fprofile-instr-generate -fcoverage-mapping -Wl,--gc-sections -o %t %s
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
+// RUN: llvm-profdata merge -o %t.profdata %t.profraw
+// RUN: llvm-cov show %t -instr-profile %t.profdata -filename-equivalence 2>&1 | FileCheck %s
+
+void foo(bool cond) { // CHECK:  1| [[@LINE]]|void foo(
+  if (cond) {         // CHECK:  1| [[@LINE]]|  if (cond) {
+  }                   // CHECK:  0| [[@LINE]]|  }
+}                     // CHECK:  1| [[@LINE]]|}
+void bar() {          // CHECK:  1| [[@LINE]]|void bar() {
+}                     // CHECK:  1| [[@LINE]]|}
+void func() {         // CHECK:  0| [[@LINE]]|void func(
+}                     // CHECK:  0| [[@LINE]]|}
+int main() {          // CHECK:  1| [[@LINE]]|int main(
+  foo(false);         // CHECK:  1| [[@LINE]]|  foo(
+  bar();              // CHECK:  1| [[@LINE]]|  bar(
+  return 0;           // CHECK:  1| [[@LINE]]|  return
+}                     // CHECK:  1| [[@LINE]]|}
+
+
+
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+