(Do not land) Very hacky patch for using -fprofile-functions in the Win-Clang build

(Do not land) Very hacky patch for using -fprofile-functions in the Win-Clang build

BUG=728324

[Nico, 2017-06-10 19:55:16]

Description was changed from

==========
(Do not land) Very hacky patch for using -fprofile-functions in the Win-Clang
build
==========

to

==========
(Do not land) Very hacky patch for using -fprofile-functions in the Win-Clang
build

BUG=728324
==========

[hans, 2017-06-19 23:39:12]

I also needed this patch to third_party/swiftshader/src to make the build happy:

iff --git a/src/OpenGL/libEGL/BUILD.gn b/src/OpenGL/libEGL/BUILD.gn
index 979fd23..f7dce67 100644
--- a/src/OpenGL/libEGL/BUILD.gn
+++ b/src/OpenGL/libEGL/BUILD.gn
@@ -109,4 +109,7 @@ shared_library("swiftshader_libEGL") {
     "../..",
     "..",
   ]
+  deps += [
+    "//build/config:exe_and_shlib_deps"
+  ]
 }
diff --git a/src/OpenGL/libGLESv2/BUILD.gn b/src/OpenGL/libGLESv2/BUILD.gn
index 1cdb672..3204cbe 100644
--- a/src/OpenGL/libGLESv2/BUILD.gn
+++ b/src/OpenGL/libGLESv2/BUILD.gn
@@ -124,4 +124,7 @@ shared_library("swiftshader_libGLESv2") {
     "../..",
     "..",
   ]
+  deps += [
+    "//build/config:exe_and_shlib_deps"
+  ]
 }



And to not inline the cygprofile calls in LLVM, I used this hack:

iff --git a/lib/Transforms/Utils/CloneFunction.cpp
b/lib/Transforms/Utils/CloneFunction.cpp
index 314c990..412fdbf 100644
--- a/lib/Transforms/Utils/CloneFunction.cpp
+++ b/lib/Transforms/Utils/CloneFunction.cpp
@@ -312,6 +312,15 @@ void PruningFunctionCloner::CloneBlock(const BasicBlock
*BB,
   for (BasicBlock::const_iterator II = StartingInst, IE = --BB->end();
        II != IE; ++II) {

+    // XXX: Don't inline the cygprofile calls.
+    if (const CallInst *CI = dyn_cast<CallInst>(II)) {
+      if (const Function *Callee = CI->getCalledFunction()) {
+        if (Callee->getName() == "__cyg_profile_func_enter" ||
+            Callee->getName() == "__cyg_profile_func_exit")
+          continue;
+      }
+    }
+
     Instruction *NewInst = II->clone();

     // Eagerly remap operands to the newly cloned instruction, except for PHI

[hans, 2017-06-19 23:40:25]

More notes:

I ran the browser with
out\release\chrome --renderer-startup-dialog --no-sandbox
to easily get the renderer process id and disable the sandbox to be able to
write out the result file

To upload, I used:
$ upload_to_google_storage.py -b chromium-browser-clang/orderfiles *.orderfile
$ gsutil setacl public-read gs://chromium-browser-clang/orderfiles/*