[compiler-rt] Add support for the dynamic shadow allocation

Summary:
This patch is adding support for dynamic shadow allocation.

This is a merge and re-commit of the following patches.

```
[compiler-rt] Fix Asan build on Android
  https://reviews.llvm.org/D24768
[compiler-rt] Add support for the dynamic shadow allocation
  https://reviews.llvm.org/D23363
```

This patch needed to re-land at the same time:
```
[asan] Support dynamic shadow address instrumentation
  https://reviews.llvm.org/D23354
```

Reviewers: rnk, zaks.anna

Subscribers: tberghammer, danalbert, kubabrecka, dberris, chrisha, llvm-commits

Differential Revision: https://reviews.llvm.org/D25104

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@282882 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/asan/asan_win.cc b/lib/asan/asan_win.cc
index 58649139e..c3f7943c2 100644
--- a/lib/asan/asan_win.cc
+++ b/lib/asan/asan_win.cc
@@ -37,6 +37,12 @@ int __asan_should_detect_stack_use_after_return() {
   return __asan_option_detect_stack_use_after_return;
 }
 
+SANITIZER_INTERFACE_ATTRIBUTE
+uptr __asan_get_shadow_memory_dynamic_address() {
+  __asan_init();
+  return __asan_shadow_memory_dynamic_address;
+}
+
 // -------------------- A workaround for the absence of weak symbols ----- {{{
 // We don't have a direct equivalent of weak symbols when using MSVC, but we can
 // use the /alternatename directive to tell the linker to default a specific