Add cdb test for inline line tables

[rnk]

Summary

This creates an integration test for inlined call line tables, and in
particular, ones that are discontiguous.

The test was reduced from https://crbug.com/965670

Depends on D62701

[thakis]

lgtm

debuginfo-tests/win_cdb/inline-line-gap.cpp

2 ↗

(On Diff #202504)

What are the [] needed for? Isn't DE[B]UGGER equivalent to just DEBUGGER?

[rnk]

debuginfo-tests/win_cdb/inline-line-gap.cpp

2 ↗

(On Diff #202504)

It's a workaround to prevent the grep from matching the RUN: grep line itself. Longer term, we could lift this pattern up into a Python script that does fancier stuff, like emitting a CHECK line of > ${cmd}, since most debugger commands are really short (r) and could match anywhere unintentionally.

debuginfo-tests/trunk/win_cdb/inline-line-gap.cpp

+// RUN: %clang_cl -MD -Od %s -o %t.exe -fuse-ld=lld -Z7
+// RUN: grep DE[B]UGGER: %s | sed -e 's/.*DE[B]UGGER: //' > %t.script
+// RUN: %cdb -cf %t.script %t.exe | FileCheck %s --check-prefixes=DEBUGGER,CHECK
+//
+// RUN: %clang_cl -MD -O2 %s -o %t.exe -fuse-ld=lld -Z7
+// RUN: grep DE[B]UGGER: %s | sed -e 's/.*DE[B]UGGER: //' > %t.script
+// RUN: %cdb -cf %t.script %t.exe | FileCheck %s --check-prefixes=DEBUGGER,CHECK
+
+// This code is structured to have an early exit with an epilogue in the middle
+// of the function, which creates a gap between the beginning of the inlined
+// code region and the end. Previously, this confused cdb.
+
+volatile bool shutting_down_ = true;
+volatile bool tearing_down_ = true;
+
+void __attribute__((optnone)) setCrashString(const char *) {}
+void __attribute__((optnone)) doTailCall() {}
+extern "C" void __declspec(noreturn) abort();
+
+void __forceinline inlineCrashFrame() {
+  if (shutting_down_ || tearing_down_) {
+    setCrashString("crashing");
+    __debugbreak();
+    // MSVC lays out calls to abort out of line, gets the layout we want.
+    abort();
+  }
+}
+
+void __declspec(noinline) callerOfInlineCrashFrame(bool is_keeping_alive) {
+  if (is_keeping_alive)
+    inlineCrashFrame();
+  else
+    doTailCall();
+}
+
+int __attribute__((optnone)) main() {
+  callerOfInlineCrashFrame(true);
+}
+
+// DEBUGGER: g
+// DEBUGGER: k3
+// CHECK: {{.*}}!inlineCrashFrame
+// CHECK: {{.*}}!callerOfInlineCrashFrame
+// CHECK: {{.*}}!main
+// DEBUGGER: q