Tweak CrashRecoveryContext::GetCurrent() to return quickly if 'gCrsahRecoveryEnabled' is false.  This avoids us needing to go to thread local storage for
the performance sensitive case where we are compiling code.

llvm-svn: 127928
diff --git a/llvm/lib/Support/CrashRecoveryContext.cpp b/llvm/lib/Support/CrashRecoveryContext.cpp
index e190051..d4e21a3 100644
--- a/llvm/lib/Support/CrashRecoveryContext.cpp
+++ b/llvm/lib/Support/CrashRecoveryContext.cpp
@@ -74,6 +74,9 @@
 }
 
 CrashRecoveryContext *CrashRecoveryContext::GetCurrent() {
+  if (!gCrashRecoveryEnabled)
+    return 0;
+
   const CrashRecoveryContextImpl *CRCI = CurrentContext.get();
   if (!CRCI)
     return 0;