Merge pull request swiftlang#10883 from 3405691582/openbsd

Cherrypick upstream LLVM changes for OpenBSD to swiftlang stable.

Author: JDevlieghere

compiler-rt/lib/builtins/cpu_model/aarch64.c

@@ -47,7 +47,7 @@ _Bool __aarch64_have_lse_atomics = false;
 #elif defined(__ANDROID__)
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/android.inc"
-#elif __has_include(<sys/auxv.h>)
+#elif defined(__linux__) && __has_include(<sys/auxv.h>)
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/sysauxv.inc"
 #else
@@ -80,7 +80,7 @@ __attribute__((__visibility__("hidden"), __nocommon__))
 #elif defined(__ANDROID__)
 #include "aarch64/fmv/mrs.inc"
 #include "aarch64/fmv/android.inc"
-#elif __has_include(<sys/auxv.h>)
+#elif defined(__linux__) && __has_include(<sys/auxv.h>)
 #include "aarch64/fmv/mrs.inc"
 #include "aarch64/fmv/sysauxv.inc"
 #else

llvm/lib/CodeGen/TargetLoweringBase.cpp

@@ -1961,6 +1961,9 @@ void TargetLoweringBase::insertSSPDeclarations(Module &M) const {
 // Currently only support "standard" __stack_chk_guard.
 // TODO: add LOAD_STACK_GUARD support.
 Value *TargetLoweringBase::getSDagStackGuard(const Module &M) const {
+  if (getTargetMachine().getTargetTriple().isOSOpenBSD()) {
+    return M.getNamedValue("__guard_local");
+  }
   return M.getNamedValue("__stack_chk_guard");
 }