Convert assert(0) to llvm_unreachable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149967 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCExpr.cpp b/lib/MC/MCExpr.cpp
index 9a19f6d..ccdccdf 100644
--- a/lib/MC/MCExpr.cpp
+++ b/lib/MC/MCExpr.cpp
@@ -132,7 +132,7 @@
   }
   }
 
-  assert(0 && "Invalid expression kind!");
+  llvm_unreachable("Invalid expression kind!");
 }
 
 void MCExpr::dump() const {
@@ -576,8 +576,7 @@
   }
   }
 
-  assert(0 && "Invalid assembly expression kind!");
-  return false;
+  llvm_unreachable("Invalid assembly expression kind!");
 }
 
 const MCSection *MCExpr::FindAssociatedSection() const {
@@ -618,6 +617,5 @@
   }
   }
 
-  assert(0 && "Invalid assembly expression kind!");
-  return 0;
+  llvm_unreachable("Invalid assembly expression kind!");
 }