[compiler-rt] Fix minimal stack reserved for unittest on MSVC build

[etienneb]

Summary

Some unittest were not able to run in 64-bit because they need more than
2MB of stack and the default allocated stack with MSVC linker is 1MB.

[rnk]

lgtm

lib/sanitizer_common/tests/CMakeLists.txt

 if(NOT MSVC)
   list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON --driver-mode=g++)
 endif()
 
 if(ANDROID)
   list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON -pie)
 endif()
 
+# MSVC linker is allocating 1M for the stack by default, which is not
+# enough for the unittests. Some unittests require more than 2M.
+# The default stack size for clang is 8M.
+if(MSVC)
+  list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON -Wl,/STACK:0x8000000)
+endif()
+
 set(SANITIZER_TEST_LINK_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBLOG log SANITIZER_TEST_LINK_LIBS)
 # NDK r10 requires -latomic almost always.
 append_list_if(ANDROID atomic SANITIZER_TEST_LINK_LIBS)
 
 append_list_if(COMPILER_RT_HAS_LIBDL -ldl SANITIZER_TEST_LINK_FLAGS_COMMON)
 append_list_if(COMPILER_RT_HAS_LIBRT -lrt SANITIZER_TEST_LINK_FLAGS_COMMON)
 append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread SANITIZER_TEST_LINK_FLAGS_COMMON)

lib/sanitizer_common/tests/sanitizer_test_main.cc

 //===-- sanitizer_test_main.cc --------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of ThreadSanitizer/AddressSanitizer runtime.
 //
 //===----------------------------------------------------------------------===//
 #include "gtest/gtest.h"
 #include "sanitizer_common/sanitizer_flags.h"
 
-#ifdef _MSC_VER
-#pragma comment(linker, "/STACK:33554432")
-#endif
-
 const char *argv0;
 
 int main(int argc, char **argv) {
   argv0 = argv[0];
   testing::GTEST_FLAG(death_test_style) = "threadsafe";
   testing::InitGoogleTest(&argc, argv);
   SetCommonFlagsDefaults();
   return RUN_ALL_TESTS();
 }