[Sparc][LEON] Detects an erratum on UT699 LEON 3 processors involving rounding mode changes and issues an appropriate user error message.

Differential Revision: https://reviews.llvm.org/D24665

llvm-svn: 284591
diff --git a/llvm/lib/Target/Sparc/SparcSubtarget.cpp b/llvm/lib/Target/Sparc/SparcSubtarget.cpp
index 75ea4c7..43ddef3 100644
--- a/llvm/lib/Target/Sparc/SparcSubtarget.cpp
+++ b/llvm/lib/Target/Sparc/SparcSubtarget.cpp
@@ -44,6 +44,7 @@
   FixFSMULD = false;
   ReplaceFMULS = false;
   FixAllFDIVSQRT = false;
+  DetectRoundChange = false;
 
   // Determine default and user specified characteristics
   std::string CPUName = CPU;