assert(0) -> LLVM_UNREACHABLE.
Make llvm_unreachable take an optional string, thus moving the cerr<< out of
line.
LLVM_UNREACHABLE is now a simple wrapper that makes the message go away for
NDEBUG builds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index 37027ee..c15e348 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -38,6 +38,7 @@
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/ADT/DepthFirstIterator.h"
 #include "llvm/ADT/SmallPtrSet.h"
@@ -255,7 +256,7 @@
     case X86II::CompareFP:  handleCompareFP(I); break;
     case X86II::CondMovFP:  handleCondMovFP(I); break;
     case X86II::SpecialFP:  handleSpecialFP(I); break;
-    default: assert(0 && "Unknown FP Type!");
+    default: LLVM_UNREACHABLE("Unknown FP Type!");
     }
 
     // Check to see if any of the values defined by this instruction are dead
@@ -945,7 +946,7 @@
   MachineInstr *MI = I;
   DebugLoc dl = MI->getDebugLoc();
   switch (MI->getOpcode()) {
-  default: assert(0 && "Unknown SpecialFP instruction!");
+  default: LLVM_UNREACHABLE("Unknown SpecialFP instruction!");
   case X86::FpGET_ST0_32:// Appears immediately after a call returning FP type!
   case X86::FpGET_ST0_64:// Appears immediately after a call returning FP type!
   case X86::FpGET_ST0_80:// Appears immediately after a call returning FP type!